Looking for container gardening ideas I did find this one.
Check it out:
http://www.youtube.com/watch?v=l7o_5UKIKTo
Great garden in plastic bottles
Sorry if I assumed you're growing veggies...
If not, here's how to retrofit a large planter. Exact same Concept.
http://davesgarden.com/community/forums/t/1094601/
Linda