Old bird baths make great planters! See the gallery of ideas for your garden.
I really like this idea
Beautiful Birdbath Planters- reuse an old birdbath and create some height in your garden. Via Hometalk
20 Crafts To Make You Fall In Love With DIYing
Dishfunctional Designs: gardening ~ bird bath turned into a planter
Ideas for Sedum Gardens in Bird Baths
Place an entire planter on a birdbath for a topiary look ~ from Dishfunctional Designs: New Uses For Old Bird Baths
ooh, don't rule out a bird bath due to stale water and mosquitos...just use it to plant more flowers in it :)
Another succulent arrangement in a birdbath.
Glass beaded bird bath... more than beautiful... it's BRILLIANT!