So 'recent' is four years ago? Does that seems a little old to anyone else? For websites at least.
For my user pic, I was just playing on Photoshop. It was part of one of those game improvement threads. I think it was Demi who also made something, looked like a CB/Coke mix. What I made took much longer and the thread died before I got finished. I'm still not done with it, but it looks cool. Link
If 'themes' have to be client side, then what level of visual manipulation can happen server side? One of the biggest things that I remember being stated for player retention (not to beat a dead horse a little more) was to make everything look pretty, not like the best game ever designed on MS excel. If we have to have client side themes, and then new players are not going to use them, certainly not when the just find the game, thus not helping retention at all, regardless of how epic and awesome the themes may be.