I used these jewelry clasps - normally meant to hold ribbon for making necklaces and bracelets. Cut small images glued to scrap paper and then just insert into clasp and squeeze clasp with pliers and you're done. The clasps have a small loop on top that you can insert a jump ring or string through. These will be cute to add to altered necklaces and projects. You can find these clasps in the jewelry findings section at Michael's or Joann's. They usually come in a package of about 25 for just a few dollars.
Thanks Connie Stuart for the idea.