Rubber Cement Resists- so easy (!) and super hands-on. You could do so many things with them! Art projects GALORE!
Now they are not the most fancy pieces of art work ever but they are fun! All you do is put rubber cement down then let it dry, paint over it and let dry, then using your finger rub the rubber cement off! Easy-Peasy!!!
Pretty much every age level would love this and you can paint designs and peel as well- ours were just abstract.
This could also make a great background for a card or other type of project that you want to do!