What else can I suggest? White clouds and otocinclus! Not so much colorful at the first sight, but indeed they are beautiful after you watch them enough. Oh, not sure about the otocinclus though. I just don't have them *YET*.
But I think it also matters on what personality you want to give to the tank. I read Tom's post in another thread, saying that he messed up his tank because of the busy tetras he got. He liked his tank being a quiet and relaxing one, but probably the tetras he got were a little too busy for that concept. So maybe you want to get something that match your preference, not just by the appearances but also by their behaviour.
I've been keeping a white cloud for cycling, and although it can swim extremely fast, usually it will make very small jerky moves so it doesn't make the tank look too busy. But maybe that's because he's alone, so I'm not sure how they'd behave in a school. I also keep 2 neons, and in my opinion they are way too greedy, picky on each other, and hyperactive for me. But again, I only have 2, so I'm not sure when they are in a school.
Anyway, as another 10 gal
owner, welcome to the club!