Moderation!
As this is games related, even though it's about preferences I'll move it to general game discussion since the offtopic room is for anything not! about games.
For myself, black background is usually best. I cannot read text but I can often see highlighting etc and I appreciate colours.
The optimum colour combination for me, and for a lot of people with reduced vision who can still see colour is yellow on black, though often I prefer having different colours just to have something to look at, this was one thing I rather liked in Rockey space invaders, the fact that the invaders etc were different colours, it reminded me strongly of games on Atari and on eighties computers like the zx spectrum or Amigar.
hth.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)