Origami is so beautiful, it can be used in decorating. It could add interest to a bookshelf, window sill or table. Take the Irish Elk by Robert Lang. Wouldn't that look lovely on a shelf next to a collection of National Geographics? How hard can it be to make something like that?! All you have to do is follow the marks on the fold pattern!
Total Cost: $3 for a ream of paper to make 1000 cranes ... for luck!