Here's a very fun imagination activity I use with kid groups.what would you choose for your hand? Of course, these things are retractable so that you fingers look like fingers until you want to use them for their special talent!
Another pinner says: glow in the dark slime UPDATE: made this and it was every bit as cool as I had hoped. Not sticky (was afraid it'd be sticky on the hands) and therefore not messy. and it glows! :) Regular slime recipe + glow in the dark paint
12 Cheap Fizzing, Popping, and Erupting Kids' Science Experiments
Salt Volcano: Pour several inches of water into a jar. Add about of vegetable oil. Drop in food coloring and observe what happens. Shake salt on top of the oil/water/food coloring mixture. Pour or sprinkle more salt, as desired.
29 Of The BEST Crafts & Activities For Kids (Parents love these, too!)