Stripes. Ive used them on my site, ive seen them on ytmnd.com, garrysmod.org, and others. Especially if you can make it fade. Besides, plaid is so out of style.
Also, those two divs on the left could be darker.
and maybe put the transition between white and orange over the footer, and put a solid orange at the bottom,with the footer stuff. I just thought that the giant orange space made it look bad.
and if you do you have to change the orange color on the links. Either way i think the site looks great.