Fun with submersible lights.
(via Play At Home Mom: Submersible Science (bath time fun))
Shaving cream bathtub paint- easy and fun!
My favorite is number 25: Replace every negative thought immediately with a positive one. Instead of, “My kids drive me crazy” think on purpose “This is a phase; Jonny really is a good kid” or “My kids must be bored. What can I do to help them?”
DIY Learning Tower. $200 (in store) vs. $20 (for parts)? Yes, please!