I've always LOVED stamps but would NEVER have thought to do this with them.  Check it out:


http://www.designspongeonline.com/2010/12/diy-project-jessicas-postage-stamp-coasters.html

And the stamp collection they link there is AMAZING!!

I am currently using the space stamps from this collection to make Elias a fun tshirt for his space themed birthday party.  FUN!