I picked these up at the thrift store for $1 each (but you may even be able to snag some for cheaper!)
Spray a light coat of white primer, then clip off the handle.
Scored this warm beige paint off the "oops" rack at HD for 50 cents.
Add two coats of beige paint, and fill with an autumn arrangement.
You can turn it towards the face side, or the back depending on your preference.
You could use autumn branches, fall flowers, dried flowers, or a small potted plant as well to fill your pumpkins.
If you want to use these outdoors, you might want to put some rocks or something else heavy inside to keep them from blowing away.