We are enjoying a much needed fall break from Classical Conversations and having fun making use of many neglected art supplies. We revisited this site for a few ideas. There are some spectacular yet simple ideas there.
The elephant tutorial can be found here. We used crayons, watercolors, and a black sharpie for our 'masterpieces'. Our only tip is to make sure the watercolors are fairly thin. Otherwise, it is difficult to see the crayon lines through the paint.