Deb, I'm assuming you had in mind a location for your tipsy pot? It it was going to be a shady location, Impatiens would work better but if there's at least several hours of morning sunlight then sempervivums could be an option. Will there be holes on the bottom of the pots? If yes, then maybe the rocks, if small enough, could be mixed in with the soil. Will the rocks at the bottom help or hinder the pots staying in the desired tipsy position?