Then DEFINITELY stuff like fenugreek and the more tender bean varieties, I personally prefer bush beans and those that have a more upright pod like cowpeas and black-eyed peas. You may get issues with spider mites using clover, but of course it's a staple and quite popular, I think dichondra could be a decent substitute here though.
Rye grass should also do quite well... what else? Let me do some searching, k?