I personally was always of the opinion that big-scale EI's should be made to please the vast majority of the users. Now, this isn't to say that they should be a bit of everything. Zodiacal, Compass of Seidh, and Gough Reed were a bit of everything and I personally do not find them to be that good - they aim to please everyone and yet no one at all.
What I'm talking about is taking a look at styles and themes that appeal to the majority of Gaians and dedicating an EI to ONE of them.
REI's should be for specific niches of users. They are smaller, cheaper, and less-involved items that could really boost many-a stylin' spirit without the general "baaaaw" over having to spend so much money and not having every pose just so.
So, here are some of my EI ideas:
1. A pick-one Lolita-Style EI => Demographic: People who love cuteness and frills
A user would have to pick male or female Lolita-themed EI where every evolution would reflect a different Lolita style.
Source: Lolita Fashion
And yes, this means that males would finally have PANTS with every evolution! Isn't this awesome? By the end of the EI, each distinct Lolita style would have hair, eyes, accessories, full costume, and a pet.
2. Anime Classics EI => Demographic: Cossplayers
Each evolution would feature a knock-off outfit of a beloved character from old-school anime. Card Captor Sakura, Sailor Moon, Gundam Wing, etc.
3. Film Noir => Demographic: Vintage lovers
We're not talking about Case of Pietro. We're talking about an honest to god murder mystery in the 20's with dramatic make up, tophats, sexy leg mods, old cars, sleek guns, tobacco and liquor paraphernalia, sassy motels, provocative companions, police dogs, dim streets, risque lingerie, and classic Hollywood hair.
And here are some of my REI ideas:
1. Zodiac-themed REI
We've had two Zodiac-themed EI's and they are terrible. Is it any wonder they are terrible? We have one poor artist sitting there trying to come up with ways to make clothes out of Zodiac animals for 12 months at a time. I'm surprised that Mishiri and Fayren hadn't committed suicide by month 6. What we need instead is one month per Zodiac and different people doing each REI - whomever has the inspiration this months takes a shot.
2. Classic Film REIs
There can be a series of REIs done after silver-screen masterpieces. Gone with the Wind, Titanic, Lord of the Rings, True Grit - there are many people who would love to dress up like their favorite characters but few who love all the classics. It'd be cool to have REI's that honor one great movie at a time. Hell, there could be a poll to decide which movie is next.
3. Season-Themed REIs
Four seasons and four REIs. Equal number of male and female poses in each REI. Pets and backdrops are welcome. New artist for each. Again, they do get bored after a while and it shows (see seasonal wedding collection).