You can turn those leftover soda bottles into a vertical garden with some supplies and a bit of crafting skills. This concept come to us from Brazilian design firm Rosenbaum, as part of a TV series of dramatic makeovers of homes. This urban garden was such a hit that Rosenbaum released these instructions so anyone create their own.
I like this idea. They use metal piping to create the project for around $300. But I think if you were on a tighter budget you could use PVC piping and PVC glue to cut the price to at least half that price. If you are a thrift store shopper, you could buy some used sheers to cut your costs even further.