What kind of litter trays do you guys use? I've seen corner litter trays, and I could get one of those from a pet store...is that what you guys get, or do you use different kinds? If you guys have pictures, that would be good. :thumbsup: Also, how many litter trays is recommended per rabbit? Is there usually one in the cage, and then one in an area outside of their cage for while they are out?