Make a fun glow-in-the-dark writeable wall! PaulBo over at FangleTronics has a really simple DIY for making a glow in the dark wall you can write on. The wall is made by adding a few coats of Glow-In-The-Dark Brush-On Paint and any type of light or LED pen will light up the wall. This is a seriously fun project for the whole family and FangieTronics does a great job of explaining how to make it.
For those without electronic skills, purchase an LED light pen or LED key light to use to write on the walls instead of making one from scratch.