This site has TONS of resources for structured play, beginning literacy activities, and hand-eye coordination broken down by age from birth and through school years. Stoplight Beanbag Toss - I Can Teach My Child! I own bean bags already!
Make colored sand art by stirring a chalk stick in a bowl of salt. it changes the color. Stir less for light color and more for dark richer color. (I used to do this with salt and food coloring. but the chalk stick idea is brilliant!
Discovery bottle - Fill to the very top with one part baby oil and one part water (with a few drops of green and blue food coloring mixed in). Shaking will produce gorgeous clear bubbles immersed in t(Bottle Green Room)