Lately I've been really into putting together Ready Mech paper art projects for The Girl. She loves 'em and I enjoy doing pointless mini-projects, so everybody wins.
I saw a link to the Ready Mech site on Boing Boing a couple of months back, and decided to give it a try. Now I'm hooked.
If you're looking to pimp-out your cubicle, and enjoy meaningless repetitive tasks, you can't lose. The site is totally free - All you need is some thick (card-stock) paper, a color printer, an x-acto knife, and some tape.
Get to cutting.