There are several games to play to make gold. Sometimes they are working and sometimes they are not but when they are up and running smoothly this may help you to get gold. Some of these do cost money to play, other's are free but if you're careful and patient, and know what you're doing (or at least close), you can make gold with all of them. Items can be sold at the Game Item Exchange Subforum, and are a good way to make income if you're good at games and spend a lot of time there. If your good you might as well make use of your talents and rack up on some gold.
1. Gaia Cards

This is by far my most favorite game and where I rack up the tickets. It is not always a winner but as far as gaining tickets I do make the most here but I play alone - I never have anyone in the room with me. Sometimes I have one other person but I find that I win more when I play alone - Does it matter, who knows.
This game also uses tokens, so you'll have to purchase those first. Far more reliable then Slots, and there's an actual strategy to it which makes it a little easier to win at.
A very good way of winning almost all the time - not always so don't take it to heart is .........
9 and below - Hit
10 or 11 - double down IF your two cards add up to more than the dealer's card. If not, hit.
12-16 - Hit if the dealer's card is a 7 or higher. Stand otherwise.
17+ - Stand
Now, you can play at this any way you want but for the most part this works but again I play alone and when there are not a lot of people online in the site.
When you save a lot of tickets then you can ..........Take them to Prize and Joy.
At Prize and Joy you can trade the tickets for items (which sell for a lot on the marketplace), or you can sell the tickets themselves on the marketplace. Depending on how patient you are, you can get away with selling them for 2-4g, maybe even more. At the very least, if you've broken even, you can double the actual amount of gold you put in! If you save enough tickets you can get the super great items and make a killing. Just be sure to check the value of the items at the marketplace before trading in your tickets and BE PATIENT - the more tickets the better the prizes and the more the chance that you can make the big bucks so hold on to the tickets until you are ready or just loose interest in playing then decide if you would make more selling the tickets themselves or the items that you could get - do a little math there gang.
2. Gaia Slots

I play this sometimes when I am bored but this is probably the most risky of all the games, as it is completely based on the computer and luck. The more people that are playing the less you win at least that is how it goes for me. I have noticed that when I play any game and do it when there are less than 50,000 gaians online that I win way more. Does that have anything to do with it ... who knows.
To play you buy tokens, which can be bought at Gold Mountain for 1g, cheaper from users and the Marketplace. Then use them on the slots. If you win, you gain tickets. (Which are worth more then tokens.) However, it is entirely on how lucky you are. You can spend thousands of gold in tokens and only get back 500 tickets. Or, you can play one game and win 300K in tickets. It all depends on luck.
Now if you are looking for tokens you can sometimes buy them for less than 1G in the Game Item Exchange Subforum. Often times, users who don't play Slots or Cards are looking to get rid of the Tokens they get from Daily Chance. Just make your own thread stating how much you'll buy a Token for (Ex. "Buying Tokens for .7G each!") or scout through threads to find users who have Tokens and are looking to get rid of them and just ask them. You can also check the marketplace and pm them - sometimes they are willing to sell them for less than the amount they have listed but in any event it is worth a shot.
3. Gaia Jigsaw

Playing Jigsaw you can win you gold or items. The gold you get depends on how fast you complete the puzzle, and at what level. Now I am not sure if it is the time that gives you the most or the amount of clicks so you can play with this. Try not worrying about the time and do it in a few clicks as possible and then do the opposite and see what made you the most. I have only played this a few times so honestly, I have no idea.
There's also a chance to win items as well; framed artwork to display in your house. (Or sell on the marketplace) There's also a chance of winning random NPC store items (both wearable and housing) as well.
Now like most things on Gaia, if you play it too much, you'll get less and less gold each time you play. So try to watch the gold you are making and when it starts dropping move on. Your only wasting your time for a smaller amount of gold when you can come back later and play it again. Most of the games and such are reset around midnight PST.
Just a tip on this ..........if you focus and practice a few of the same puzzles over and over again, you'll eventually learn them well enough to do them really fast and get gold quicker. If you're doing an insane-level puzzle, save before you finish, then leave it for awhile. When you come back to it, you'll get more gold.
4. Gaia Fishing

The first thing that you will need in order to fish is to buy bait and and a fishing rod. I do believe that you used to get a rod of some sort when you joined Gaia but they may have changed that now. In any event, the better the rod the easier it is to catch fish, and the better the bait the better the fish that you catch.
The fish you catch can be sold to the stores, marketplace, or used at Logan's Item's Exchange to get items. There's also a very high chance of getting garbage. (YUCK!)
There are three Fishing Hole's to fish in, each with a harder difficulty than the last: Bassāken Lake, Port of Gambino, & Durem Reclamation Factory.
I have never fished and do not intend to (not online anyway..lol) so if you want more information on how to do it and what items you can get then let me know and I will share that with you at that time.
5. Word Bump

This game is set up so that you can win gold, credits that can be traded in at Edmund's Item Exchange, and even housing and clothing items. The higher level you manage to get in the game, the greater the rewards are, (IE, more gold per each level, better credits, etc) and on every 30th level or so you win an item.
Now the items that you get are not specific items. They are completely random however, and an item you get on level 30 could be better or worse than on level 60 so try and keep that in mind.
This is a game that is constantly broken and not paying out gold so pay attention and make sure that you are getting gold before you sit and play for an hour. Try to finish a few levels and see if you get anything before sitting there playing to level 50 .... It always helps to pay attention when playing these games to make sure that you are getting something for them otherwise unless you are just bored and want to play for the fun of it you are wasting your time.
6. Gaia Towns

There are many ways of getting items and gold in towns. Shaking trees, bushes, and rocks give you a chance of getting gold. Also, there is -tons- of garbage, flowers, and bugs for you to collect, all of which can get you gold if you know how to go about doing it.
You may be wondering what to do with all this garbage, flowers, and bugs you've been collecting.
Don't like the market place but still want to make money on your flowers, trash and bugs ..............go to the Gaia Item Exchange.
There's something that I do, that helps me earn gold really quickly. I go play the games, and collect as many items as I can, and with bugs, create ink. From there, go to the towns exchange forum and there people will be asking to buy your junk off of you. If you have a trading pass, then just send it to them, and they'll send gold or better items in return. For me, I gain gold really quickly, and I'm sure it would help everyone else. I know people try to sell their junk in the marketplace, and it doesn't sell, but there...the people are specifically looking for those items.
For those who don't mind the marketplace...
One way I found to make money that is extremely tedious and time consuming but over time will give a decent return is to buy the stuff on the marketplace for 1g, flowers or bugs or whatever. Sometimes you can get more than one for 1g, but that doesn't matter much. You get the 4g for surfing, usually at least once for every 2 items purchased, sometimes more often so you're at least doubling your money there, and you can sell the items back later, also making money for surfing on top of whatever you get for selling things. This is how I got my start up money. I had about 10g to my name and by the end of the night (it was like 6 or 7 hours later mind you) I had several hundred. It's not for everyone, but it does work biggrin
6. Gaia Pinball

Click here for Gaia's official FAQ on Pinball.
The newest game on Gaia. Basic Pinball game, playing the game grants a certain amount of gold depending on how many points you get. Also, if you get a fairly high score (Starting at 1 million points), the game starts granting special Pinball only equipable items as prizes. The game also grants various power ups if you can hit the ball into Barton Shop.
I have played this once or twice so I will continue to look for you information and tips on how to play this game if anyone is interested.
7. Gaia Virtual Lounge

For those who can't get away from Gaia even while not on Gaia. Virtual Lounge, also known as the OMG widget is a mini Gaia hang out you can add to your Facebook or Bebo profile. It allowes you to hang out with out Gaia users using the widget, and earn exclusive items and gold at the same time.
See:
http://www.facebook.com/
http://www.bebo.com/
8. Gaia VJ

For those who can't get away from Gaia even while not on Gaia. Virtual Lounge, also known as the OMG widget is a mini Gaia hang out you can add to your Facebook or Bebo profile to. It allowes you to hang out with out Gaia users using the widget, and earn exclusive items and gold at the same time.
SO there you have it about Games and Towns. If you have any specifics to add that will help others please feel free to do so.