IMO, here are some things that makes black glass look awesome. Correct overlays for the lip tips and the riser. Example the Whip above. Then comes the riser wood(s). Nothing with too much contrast; you don't want it taking away from the simple beauty of the black glass and overlays.
You want to see a wonderful example of a black riser with black glass and wonderful overlays? Go to TimberGhost archery website and look at the model Smoke Hybrid....stunning.
Beauty is in the mind of the beholder.