craftgrrl | question and online store recommendations...

I have these little this plastic animals that I want to make into charms for neclaces but I'm not sure how to go about making these into charms or pendants, there is no place that I can put a ring into them. If I try to make a hole in the body of the animals, the plastic will crack. These animals are hollow on the back, I thought maybe I could fill them up with something and then add a ring? Any suggestions?

Also any good online stores that sell really cute beads (plastic, unique)?

I mainly would like to find vintage plastic gun charms, tanks, grenades, etc..

Thanks!