i just picked a few games off the top of my head that i'm excited about and started eyeballing it and made a regular background at first.. but then i went a little ocd on it until it didn't tile, it looks perfect if you're running at 1920x1200 
 
a little crazy, or whaddya think?

I laughed when I saw your avatar. :)

dammit i just looked at an achievement page that was way long and it did eventually tile....looks great on my profile page tho  =)

Almost thought the same person posted three times when I got here lol.

Just make the height of your background image like 20000 pixels or something.