If i had a 10gal i'd turn it into a planted tank/somewhere where i can grow plants in an enviroment where i ca chuck loads of fertilisers and stuff in- i actually have a spare 10gal right now and are considering doing this. It would be nice to have a low maintanence but good looking tank anyways though .
I made a nano reef with my 10 gallon. Its only 4 months old but it has LR, turbo snail, two hermits, shrimp goby, blind pistol shrimp (paired with the goby), green button polyp...and lots of coraline algae.
Course I could have just as easily went with a planted/shrimp/frog/snail deal.
Also liked the idea of doing a bonsai type deal with miniature everything.
Man you sure got a lot of responses on this. Who knew 10 gallon tanks could be so fun!