I've considered using kitty litter boxes and putting 6-ish clones in each. Basically a very small raised bed garden. I'm sure it'd work okay. Right now I'm doing a SOG experiment, using 1/2-gallon pots, one plant per. That's working, but somewhat of a pain in the ass. My kitty litter trays hold about 5 gallons, so the plants would actually get *more* root space with them than they are currently with the individual 1/2-gallon pots. Not that lack of root space is in any way keeping these plants (AK-48) tiny -- they're getting quite large, and seem to peak at around 3 feet tall, maybe a little more, after flowering them at 5".