A - It's rather simple, it's nice but it's also missing a few details on it, such as being able to uniquely design their own avatar, and what you can post about (such as popular topics that could capture different groups of people).
B - It's pretty much like A but much better. It gives more details into what you can do on Gaia and can capture different groups of people together. The header is rather catchy as well, as it may lure more people into the web site.
C - This is rather okay - it shows examples of creative ways to create your own type of avatar and gives brief statement on what you can do on Gaia, but I don't quite see, as myself, being catchy (to lure myself in if I wasn't playing Gaia). Although, I love the humor on the page.
D - This one is rather well, too. It shows zOMG, and what you can do there (hits game-players into games such as), it shows the aquarium and informs you that you can create one. States you can design their own avatar and even shows certain "popular" topics. I personally think it's very eye-catchy.
E - I think this is perfect to use on Gaia, since anime is huge here, it would really draw in anime-fans and it has a really nice feel to it, I like it a lot and it lures me in.
F - Hm, this one is rather good - it really brings attention and can lure you in easily. But it doesn't have much information on the page itself. It pretty much just states that you shop, dress and than show your avatar off. With no information on anything else (such as the forums, how to earn gold, zOMG etcetc).
G - Pretty much the same as F, although it can (at the same time) grab a few groups of people, such as the main focus on the image (which would be the middle) - it can grab Cosplayers, cat fans, and yet grab just other people with the first and second avatar. But, it doesn't give much detail onto the whole web site.
H - Well, it is very eye-catchy and makes you want to learn more about it (for myself at least), but considering not everyone thinks like I do - I would assume a lot of people look past it since it doesn't explain much. So, it's a bit like F and G.
I - I'm not true sure with this one considering Homes hasn't been updated in awhile... it could possible grab people that are just looking to make friends or gamers (due to the top banner), but I don't think it would lure a wide-variety of people. It doesn't have much details on the web site itself.
J - This one has a lot of details yet is still eye-catchy. It explains that you can create your own avatar in their own unique style, states how you can earn gold, that you can create your own unique profile (and even add music), and you also state a few topics (the bubbles over the head) with unique-styled avatars, so it would most likely draw all types of people into Gaia.
K - It's really nice art and pretty much shows the concept of Gaia (in a way) but I believe if you're completely new to this web site you might not so understand it, it may make people want to join just to learn more but it could also just make people look the other way. However, with the art being as lovely as it is, it would most likely grab people's attention.
L - Mhm, to be honest - I don't quite like this one, it really doesn't go into details other than you can go from poor to rich... it has pictures and everything, but it doesn't go into any detail whatsoever.
M - I really like this and think this would probably be the best to use. It's new, flashy and actually shows real users ; including, people may check out what someone was doing, enjoy it and easily get interested enough to join.