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.
DIY Outdoor Solar Light Display : 2 fence posts + 4 solar outdoor lights + 8 extra long screws + an long scrap of treated x wood. great idea for the deck or patio! I would have a different style of wood and lights but great idea nonetheless.
Reuse an old tree to make a log pathway in your garden. Good use of "yard" trees and other wood that can't be milled; works much better in climates without termites. Good drainage under the log rounds will make the path last longer.