Lowes sells the 4 to 6 round PVC pipe with holes already drilled. Purchase an end cap, fill with rock, soil, and plant. add amazing height and color to a container that has trailing plants (no end cap or rock needed if you are placing in a container)
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.