(click on the origamic architecture link in the first paragraph)
How awesome is that??? The site's bilingual, so don't worry if you find yourself staring at a bunch of French (unless of course you read French, which is a bonus for you, now isn't it?) just scroll until you find the English parts. There's a ton of instructions on how to do these, it's basically a .pdf page that has all your cut and fold lines marked (cut the solids, fold the dashed). It really can't get much simpler than that I think.
So go have fun and make some awesome pop-out art.