profilebrand.com
Gaia is a forum community. If one would like to find Gaia layouts online so that one can customise one's profile, a good place to start would be the website ProfileBrand, which offers a number of different layout choices.
Another very popular one is ProfileBrand.com. its a very good website for gaia layouts.
SunnyNeo has good neopets related layouts, but neofaeriewings.co.nr has good non-neopets related layouts.
beboskinz.com
A good one is the Celtic cross spread. I am sure you can find a picture and instructions online.
mail me mcrea to get a layout
There are many websites that provide good listings of free vintage MySpace layouts. One would be able to find these layouts on websites such as Fillster.
Gaia Online has some pretty good manga avatars
Enter an original and amazing avatar.
I use sunnyneo, jellyneo, or the Graphicbin.
You can find good default layouts at: http://profilerehab.com/browse/myspace/default_layouts
There are, in fact, plenty of dress-up, mmorpg-style games around the internet, and most of them are advertised right on gaia-online. from my knowledge, though, gaia-online seems to be the most popular and the safest (when it comes to viruses and scams)