The EcoAquariums are little cubes with two African dwarf amphibious frogs inside that only need feeding twice a week and their water changed every three months. The complete kits come with your choice of colored gravel in addition to the two frogs, bamboo stalk and living gravel.
Buy it: www.wildcreations.com/
You can also get these at any School Box location, which is where we got ours. They make great pets — ours is alive and kicking after 3 years!