There are several options. An "umbrella plant" or Schefflera sp., and a larger sturdy Ficus tree. Some keepers add bushy Pothos, Hibiscus, or even dwarf citrus trees. You can often find these at home improvement stores with a garden dept, houseplant stores or nurseries as "tropical foliage". Just be aware that you should plan on re-potting the plants with clean potting soil without added pesticides or perlite (those white crunchy kernals) and washing the plant leaves carefully to remove any chemical residues.