Try some little wooden, foam or chipboard cut-outs from Michael's, Joann's, etc. Most craft stores should have a variety of cut-out shapes that you can easily paint and apply a little self-adhesive name tag pin on the back.
Examples:
(wooden shapes)
http://www.joann.com/joann/catalog.j...PRODID=prd1665
(foam shapes)
http://www.joann.com/joann/catalog.j...RODID=prd33930
(name tag backing)
http://www.joann.com/joann/catalog.j...PRODID=prd2067
These are not the self-adhesive kind. Save yourself some trouble and get the adhesive-backed ones