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This pictorial how to from the Jersey City List shows how to make the cuts and turn the tire inside out to create the planter. If you have leftover rims, you can use that as a pedestal base for your planter and you can paint them to what ever style or color suits your garden.
If you have more tires than you know what to do with, here is your guide to recycling them! unconsumption: In Anytown, USA (or worldwide) you’ll find more free tires than you’ll know what to do with. A roundup of projects making use of all those tires; not a lot of detail, but some great pix: Relaxshacks.com: House Built from Tires Part Two- (and TEN other recycled uses for them)