Amanda,
I think it would be cheaper and easier to put them in their own holder, which could be pushed into the ground. Going the other route would probably make things a little expensive, although I don't know that for sure.
Nice image you have there to put into a medallion.
Paulette,
I like your idea about the dowel made tree. Just think - when the divorce does occur, you no longer have to cut someone out of the picture!
Ed