Hi welcome to the forum and the hobby
I quite like what you have done with the tank, but dont be afraid of live plants, you cant beat them if you want a natural look. Colin above has pointed out some good points
I personally prefer black backgrounds to blue in freshwater, blue makes more sense to me in marine tanks.
Can I just ask how you are cycling your tank? I know you dont have fish in there but are you using bottled ammonia or shop bought products?
If your tank is 10 gallons I would look at what are called nano fish, which are suitable will depend on what your tap water is like. Do you know your ph and do you do know if your water is soft or hard?
I would try and find a good local shop and try and source some slightly more unusual species of tetras and raspboras as most of the common 'small' schooling fish wouldnt do as well in this size tank as some of these, things like Neon Tetras or Harlequin Rasbora are actually quite big fish for this size tank.
The types of fish I would look at (depending on your water) would be things like Ember Tetras, Chilli Rasboras, Celestial Pearl Danios, Green Neon Tetras. If you wanted bottom dwellers, you would need to swap your gravel for sand though you could look at Dwarf Cory Catfish, Rosy Loaches or Dwarf Anchor Catfish. Then if you wanted feature fish, something like Scarlet Badis, Pyjami Badis, Pygmi Gourami or Clown Killifish.
Like I say it would depend on your water but you can make a really nice tiny community if you plan it well and source the correct species of fish
Wills