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If you want colour you could try dwarf rainbow fish. The Pacific forktail blue eyes are my favorite. Of course livebearers (especially) platys have a lot of colour. Tetras are a nice cheaper option. Tiger barbs are beautiful when full grown against a heavily planted tank.
Or you can go in the other direction.
Make a blackwater tank. Lot of tannins and keep black neons in it. There are a lot of non-colourful types of fish that are beautiful in their own way as well.