Melted Crayon Art - This is a fab process art activity for tweens and teens that produces stunning results. A great alternative kids craft for using crayons. This DIY craft has to be seen to be believed.
Rainbow Rice Garden for Play: Measure rice cups) and put it in a Ziploc bag with about of food coloring or liquid water colors (works great!) and 3 T of rubbing alcohol. mix the rice in the bags to spread the color.