Add subtle background

[jpezzino]

http://subtlepatterns.com

[jpezzino]

Why the fuck can't I just link to /images/derp.png. How is that not a core functionality of rails.

[jpezzino]

jk it's just /assets/herp.jpg herp derp

[jpezzino]

Since you closed this I'm assuming you're ok with the triangles. I don't think it's perfect but it's good enough for now, won't change unless Andrea has an opinion.