Check out this GelliBaff stuff that turns water into a slimy substance. It looks like it would make for some pretty cool games. Too bad it’s only available in the UK. I’m sure there are alternatives in the good ol’ USA. Check out the link, though. It’s worth it just to hear the commercial.
(via: Boing Boing)
I think this is the stuff found in diapers. You can actually buy a big bag of something similar at this site
http://www.stevespanglerscience.com/product/1278. It will turn back to water by adding salt. I don’t know if I want to play in it or anything, but it looks cool.