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Do you want floating plants, or plants that are actually rooted?
If you want floating plants, you can go with just about any of them: Duckweed, Dwarf Water Lettuce, Amazon Frogbit, etc.
If you ware wanting rooted plants, you could do something like Moneywort and allow it to grow up to the top of the water. I currently have a Red Tiger Lotus in my low-medium light Betta tank, it isn't optimal for the plant but the leaves that reach the surface are great for him.
As far as nice looking, that is all in the eye of the beholder.