Tillandsia (a type of bromeliad) are also a possibility:
Tillandsia - Wikipedia, the free encyclopedia
Tillandsia International Bromeliad Air Plants
What type of viv do you have? Desert/arid, tropical/humid . . . ? The type of plant really depends upon the environment you're providing. The catts (Cattleyas) will need higher humidity, and they need a lot of space. They also need a fair amount of light (20,000 to 30,000 Lux) with a maximum temperature of 75 deg F (they can take up to 85 for very short periods, but not daily)--the best temps during the summer are 65-76 deg:
AOS | Cattleya Culture for the Beginner
If your viv is small or your fauna need a lot of warmth, don't try catts; however, there are other orchids that stay small and would thrive in those conditions. Also, Tillies (Tillandsia) come in small and large sizes and both arid- and humidity-loving species.
With more details about your viv--size, orientation, the animals you're including, the amount of light you can provide (that works with the animals), the temps, the humidity--we can help you better.