you just need rocks. water, and water soluble crayons - i used Faber Castell Crayons. then of course, glue, goggle eyes, and even scrap threads for hair. :D
soak your rocks in water, then pull them out and rub the water crayons onto them. if your rock dries when you're still coloring, just dip your crayon into the water then rub it onto the rock for more color. wheeeeeee!