well, that's an awfully small tank...

some of the little male guppies have some great coloring. unless i missed something, you have 2 guppies and one molly? are both your guppies male? (if not, you'll be needing a fry tank, btw...)
i'm really at a loss as far as what else to suggest... if you only have what i mentioned above, you MIGHT be able to get away with a couple of kuhli loaches... might put you at heavily stocked, (and you would have to compensate by doing lots of water changes, etc...) but they have tons of personality, and do a bit of clean up... really though, in all honesty a 10g is simply too small for a great variety of fish. even a 20g (while not taking up much more room) would give you a lot more options.