DIY: Pool Noodle Race Track
I would do similar colors (all shades of one color, or primary secondary blends) so that you don't get any of that funky brown when they melt together.
Goin to have to try this sometime!
Elf on a Shelf - Slinky jumping
20 iPad2 Tips, Tricks & Shortcuts
Yo Gabba Gabba
Duct Tape Wristlet
make my own melted crayon art
The Gigantic Water Play Slide - Hammacher Schlemmer