What to do with this tank?

#1
MY aunt is buying me a 10 or 15 gallon aquairum for my last report card, straight A's!!!! LOl well i don't know what to do with it now...

MY old plans were
Crabs(half water and half land)
Blue Ram cichlid breeding
dwarf puffers and some other fish
But i don't know what to do give me ideas!! I want somethign EXOTIC, something new, not plan fish anymore, i've only been at this 7 months and my small crab tank, betta tank, puffer tank, and community tnak are getting BORING