What should i get for my aquarium?

Ok so i have a fully cycled 10 gallon aquarium un heated(yes i know its kinda small) It has a good filter and light and a gravel ,rocks, 2 tiny terra cotta pots and a piece of driftwood. It has no heater so what is recommended to me must be tolerant to an un heated tank. I don't mind if it is fish or other species for my tank or a combination. So far i have thought of white cloud mountain minnows but what else is available to me. I would really like shrimp but are there any that are ok in cold water if so tell me and also I have seen a blue lobster it looks small now, but will it be ok forever or will it grow too big