Well what about Hissing Cockroaches? Whites tree frogs, red eyed tree frogs? I also have my gecko in a ten gallon tank, he is a white spot gecko. Millepede maybe? Walking sticks? We have some really great Australia leaf sticks here and they are just as neat as the mantids are.

I just bought a colony of Lobster roaches, but they are much uglier than the Hissers and look more like roaches you find running around your house LOL. Not many people like them.