I've been wanting to order a butterfly cage and put an orchid plant in it for my orchid mantis. Would be nice. Would also require a compact fluorescent to keep the plant alive but you'd have to keep the bulb far so you don't cook the mantis.
My chameleons benefit from eating their ficus trees. It's hysterical too so I benefit. haha
I could see the mantis intake some good nutrients or something from eating their greens.