For the small one you could put something cool like a small piece of driftwood and a Chirita or Episcea and maybe a vining hoya like curtisii, a small fern that will stay small and something like cryptanthus bromeliads. You can do a backing with something like coir matting, tree fern bark or cork to allow vining plants to climb, or if you want to keep it clear and wide open skip that. Creepers that you can readily trim like the cool purple and silver trandeschantia would work too
