Collagraphy.

Collagraphy is a really fun media.  In this printing method you can use virtually anything to create a print.  The whole concept to create a collagraph is to use a rigid support such as cardboard or wood and applying materials- anything from twigs and leaves to bottle caps and lighters to create a printable image.  In this process the key is finding similar depth items to create an even print surface, though a little character can go a long way.  

This is a fun print process, and i've done some things similar to this.  When I was younger I'd print t-shirts with dead fish or frogs and cool shit like that.