My friend Samantha introduced me to this fab new craft supply...it comes in a thin sheet like cardboard...you can cut it into shapes or use a die-cutting machine to stamp out shapes into it......
Then you put the shapes into water and they puff up into sponges for sponge painting...........
Kids LOVE wtaching them puff up...even Christopher got in on the action and puffed some up!
Its less than $2 for a big sheet and you can get plenty of shapes from one sheet......and the place we get ours from also has all the die cutting shapes to use for free :)
Very cool!