I've always thought it would be really neat to make a cave tank with a styrofoam and epoxy background on 3 sides and the floor of the tank, maybe on the lid as well, with the lighting from low wattage red or blue bulbs. Blind Cave Tetras, albino bronze Cories, and an albino bristlenose pleco. Maybe an albino weather loach or 3 if the tank were big enough.
Bear in mind that you'll need to incorporate some driftwood in your hardscape if you go with a bristlenose pleco.
That said, if you want a tank with a dark substrate and really light rocks (which won't, I think, look as good as you imagine. Try washed anthracite coal instead), then one suspects that you would want to keep the lighting subdued, which will severely limit your choice of plants to Anubias, Cryptocoryne (and not all species at that), Java Fern, and Java Moss.
If you can lay hands on the Windoloev variant of Java Fern, that would look really nice.
I have it! If you can get "Pellia" Monosolenium tenerum, that would look awesome. Very undemanding. Looks like riccia writ large and flat. Here
is it's Tropica card. Make some steps at the back of the tank and plant it on the top step (tie it down), and let it march down them over time.