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5 boesemani rainbowfish
5 dwarf neon rainbowfish
1 redtail black shark
2 German blue rams
15 neon tetras
All of these fish love lots of plants, especially the neon tetras and rainbows. This would just about fill the tank, but would probably be a nice setup.
I have 12 tetras (A combo of glow light, black neon, and cardinal), 3 angels, 2 BNPs, 6 ottos, pair of Apistos, and 6 Albino corys. Seems just right and not crowded. Just for a ball park of what you could get.
Are you going for an aquascape, biotopes, or just b/c I like it?
Aside from nano fish I have a soft spot for wild type livebearers.
Endlers
Goodieds
Limia
Swordtail
Platys
Wild type guppies
Least killifish
Many of these are CARES fish and some are thought to be extinct in the wild.
There are also native type fish. Some north american native fish species are just as or more colorful than their south american cousins. My favorite is the pygmy sunfish (elassoma).
Many of these are not available at your LFS. Cruise the classifieds for more ideas, pop in and check the comments for commercial retailers or check the auctions at AquaBid.