Three ways to make Sea Urchins:
1. Use crumbly playdough from a failed playdough recipe (we substituted whole wheat flour for white flour--oops!) and stick colored toothpicks into them for a colorful sea creature.
2. Use toilet paper rolls cut in half and stick packing peanuts around the sides. They also made seaweed using this method.
3. Clay and pipecleaners also make great sea urchins or anenomes.