Along the same lines of the Firefly Toothbrush, I like this Squid Soap by Airborne. It “stamps” your child’s hand with a vegetable dye when they push the pump, and it takes about 20 seconds of hand washing to scrub off the ink mark (to “train” them to wash their hands longer without having to stand there and sing a round of “Happy Birthday”). It also has a rubber squid on top, which is pretty cool. We haven’t tried this, but I told my son about it, and he said he wanted to pretend he had a stamp on his hands, and he counted to 20 while pretending to wash it off. That lasted less than a day!

$4.95 for SquidSoap at Creative Kidstuff