How to Make a Leak Proof Water Blob (without tape!).
DIY Jet Pack
DIY: Keeping Legos Clean. Do this with many toys, especially after play dates with sick kids! WOW!! FANTASTIC idea
someday i'll be the cool mom who shows her kids how to make one of these. :) Under the table hammock
Upcycle an old boat/canoe into a sand box. You could even make a sail out of tarp that can also double as the sandbox cover.
25 play tents for kids - When my kids were little, I had a tent that folded flat. Spent many, many hours playing in that tent. Every kids should have a tent.
What a cool gift for a kid. A Build your own fort kit. $29.99.
joybobo: DIY Superhero Cape Tutorial
How to restore Barbie hair! Omg I wish I knew this when I was a kid.