i think anything you have can be submitted. but what's the point if your not selling them? if it's photographically good, sell it. people like weird things. it could be a niche for you. the only thing that can detract are:
bad photos
very negative things - like hate, nazi's etc. but stock companies still sell them fine.
not that many things.
i have some really odd things, and i seem to sell fine.
---Mike Savad
MikeSavad.com