Silly Putty
1/2 Cup Elmer's glue
1/2 Cup Starch -- liquid
Food coloring
Do NOT substitute any other glue for Elmer's glue! Slowly add starch to glue and knead with fingers. The more you work with it the better it gels. Add food coloring if you want.
Easy Silly Putty
Equal parts cornstarch and Elmer's Glue