Petr is right, the current default (Dark Blue is it called?) is pretty good.
Tip: never use lime green background, it will have you seeing red!
BTW I am noticing an odd thing: When I click a .bas file from Windows File Explorer, QB64 loads up into current version because I had updated that, BUT, it is NOT loaded with my chosen Color Scheme that works off a Shortcut that I pinned to Task Bar? The Default Color Scheme loads in, and I am somewhat confused by this. I think, if I recall correctly, if I do change it to edit some more it does get changed... awhhhh Windows has update and isn't letting me use File Explorer to check whether color scheme I then specify is remembered next time I click.
Got's to go and let Windows do it's dang update.