I'm also looking at other types of bugs, besides the normal listed on this site, and I agree the hard shell of roly-polys might be a problem. I'm thinking of trying spikes/maggots, which are blue bottle larvae. I would also consider crain fly (leather jacket) larvae if I could find a breeder. They don't require heat like crickets, etc. They are thriving here in WA state but they are considered a pest and the state would like to control them.