I've been doing a lot of stamp carving lately and as a consequence, I've got lots of leftover rubber scraps. I hate to waste it, so I make "trash" stamps: random little designs on the leftover scraps. The first stamp.
Wrap some baker's twine or other string around a wooden block to create a graphic textured stamp. -can also use rubber bands- Stamp on inside of paper bags from grocery store or paper that comes in mailed packages, use as wrapping paper.