According to some sites there are these 10 plants safe for dogs and cats...but you still have to cross check to see if they are safe for small humans with an overload of curiosity.
African violet (Saintpaulia)
Air plants (Tillandsia)
Ferns - Maidenhair (Adiantum), Boston (Nephrolepis exaltata), and Bird's Nest (Asplenium nidus)
Orchid (Orchidaceae)
Peperomia (Peperomia pellucida)
Prayer Plant (Maranta)
Spider Plant (Chlorophytum comosum)
Succulents (Echeveria, Jade, Kalanchoe)
Zebra Plant (Aphelandra squarrosa)
