Parker loves to paint but he quickly fills up a piece of paper in mere minutes. So instead of wasting sheet after sheet of paper and in my quest to find anything to give me a few minutes break I set him up with some paints outside on our deck so he could paint our patio glass windows!
I just mixed some tempera paint with a few drops of dishsoap in a cup, gave him some paintbrushes and let him loose on the windows. He was entertained for half an hour... that's alot for a not yet two year old!
To clean up, all you need is a bucket of water and a wash cloth. It comes off so easily because of the soap added in to the paints.