DIY - Glow in the dark pots with mums for fall/Halloween. Buy a flower pot that you really like and use Rustoleum's Glow-in-the-dark paint to paint the pot. During the day, the paint will absorb the sunlight and at night the pots will glow.
Natural Water Gardens - Small freshwater gardens are fun to create and simple to care for. And all you need are a few floating or submerged greens in a vintage aquarium, an apothecary jar, or a sleek glass cylinder.