Gardening with wood pallets is very popular and for a good reason. Most projects are cheap, especially if the pallets are free, and pretty easy to build. For those who don’t consider themselves a gardener, this is a way to start on a small scale by growing just a few vegetables or herbs. It’s ideal for small yards or those who don’t really have space for a garden.
What I like about it is that it’s vertical gardening as you utilize the gaps, and it ends up three levels high, instead of spreading out. Also, if you want to dismantle it when you’re finished for the growing season, just take it apart and store it until next year.
For complete instructions with photos of each step: eHow