I've always wanted to make my own rubber stamps. I even went so far as to buy a kit several years ago, complete with a black light and goo. It didn't work for me.
This might even make a nice coloring book type of activity. "Color in all of the openings and don't bother me until you're done. I'm busy blogging".
I also punched out my favorite scalloped circle then debossed it with a table knife.