Small Dwarf Honey Gouramis are Very Nice and are very funny to watch, They Fence each other with their Feelers.
From My sig You can see that I have Ended Up with a Gourami Dominated Tank.
My Newest Addition Being an Asian Gourami, (I think Its Called) It looks very similar to the Paradise Gourami but more slender and Brighter Colors.
Neons are Very Nice. There are A few you could try:
Standard Neons.
Black Line Neons - Alot Larger and Tougher than Blue/Green Neons
Glo-Lights - Look very Nice when the Stripe Matures.
Then yo Have the Tetras:
Blue - Nice but Aggressive Fin Nippers.
Lemon - Nice and same with the glo-Lights alot nicer whan colors Mature.
Rasboras - Only got these this week but they are really very nice to watch and they reflect alot of color and Shimmer. They look great in the School of 10 I have.
But you have many Choices out there, But make sure you get fish that won't feel threatened by the Danios.
I agree that Soem Corys would be Very Nice. Albino are nice and so are Peppered, My Blend into the Slate too well and its hard to see them.
I would Not Suggest Mixing Leopards and Zebras, They can be very Temperamental, and will gang up on each other.
My Leopards killed Most of the Zebras then Turned on each other.