Any Ideas?

A student arrived at my classroom door this morning with the box of dense foam goodies pictured here- leftovers from a factory where his mother works which usually end up in the dumpster. Some have paper backing on a sticky side. Printmaking possibilies? The 'flower' shapes are about 6 inches across. She called to ask if I'd like more. Absolutely! Now, I just need to figure out what to do with these cool objects!
Ideas anyone?