All the spiky, prickly, weird, moisture-retaining crazy plants you could hope for. I performed some retail therapy but I don't have any pictures of those yet.
Not a lot of agaves, but I did see this awesome one, also in the show. It's like that Far Side cartoon: How nature says "do not touch"
There was a whole table of blooming cactus for sale. ORANGE!
I have this theory that desert plants haven't been crossed and cultivated and groomed for thousands of years, like roses and hydrangeas and lilacs have, so they often still have these weird, misshapen forms that I am growing to enjoy.
castle in the Dark Crystal, while it was still eeeeeevil. (I, ahem, might have bought a much smaller version of this.) I'll take pictures of the medusoid euphorbia this weekend. It looks like a nest of baby snakes.