I've never really created a YouTube background, but I just wanted something easy for now for my profile.
So I tried to just draw a 2x3 grid of some logos of games I like.
That seemed to be a cool way to do it.
Let me know what you think!
http://www.youtube.com/user/ColonelMagus
Here's a picture of all the 6 versions I exported that were considered. I went with the purple one for now at least.