Rope lighting in flower beds. This works perfect for lighting a walkway. I used the rope light holders that stick in the ground and cut off half the spike.
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.
Reuse re-purpose old rain gutters as planters. Reuse a vintage laundry wash tub to catch the run-off and re-circulate