(Small) Rock Planter; "No, no, Natasha!"
Just for fun I used a hole saw to drill a cavity into a piece of feather rock, then planted an Echeveria pulidonis in the cavity. It has been content enough with the rock to bloom.
Slow-growing Echeveria pulidonis has a pure yellow flower. If your planter is small, a slow growing plant is a good idea. Feather rock is a type of volcanic rock that traps a lot of air in itself and thus is very light. It's like pumice, only more glassy. It can be very sharp, so one must be careful when handling it. It also appears to retain some moisture for a while, which is helpful for the plant.
In other news, the puppies are so very good. If they have a little accident, they are enthusiastic about helping to clean it up.
"No no, Natasha!" says Boris. "Don't eat the poop! Use a paper towel!"
"Oh, an extra paper towel! I'd better pee on it!"
"There! All clean!"
"Now what shall we do? I know, let's go sit on the furniture!"
Puppies. They're heeeere!