Rain Bottle ~ fill a dry empty bottle with a box of toothpicks. Add rice (uncooked) to the bottle leaving an empty space of about 1 inches at the top. Seal the lid. As you gently turn the bottle, the rice falls through the toothpicks, sounding like rain.
The Imagination Tree: DIY Rain Stick - Make a rain stick using recycled materials and things from around the house. A fantastic musical instrument for young children that sounds just like falling rain!
Science or Color Week (States of Matter / Color Mixing) Make primary colored ice cubes. Put two different colored ice cubes in a class and see what color they will make when they melt. Let the kids make predictions!