If you ride bikes, chances are, you have a lot of old bike tires lying around like we do. I decided to use a couple to make a small, raised garden bed.
I picked a sunny spot in the backyard, south of the crape myrtle tree. I used a garden spade to loosen up the ground a bit.

I used garden staples to secure the bottom tire and used a regular stapler to connect the bottom tire to the top tire. (If I had to do it again, I would like to come up with a better way to sew the two tires together - maybe twine and an upholstery needle.)

Then I filled it with garden soil making sure to get into the edges of the tire. For the two 29'er mountain bike tires, I used between 1 and 2 cubic feet of soil.

Then I planted a dwarf species (70 days to bloom).

Although not pictured, I decided to put some landscaping rocks around the bed for support until I see what happens when it rains.

I have no idea if this will work. If it does, I'll redo in the spring or make changes and try again.