I spend a lot of time re-doing my workspace prefs for things like code
generation comments, and I've completely given up on customizing the
editor colors  -- I'd really like to have a black background and bright
text for everything, but, I got sick of having to change it every time I
updated eclipse, and for every new workspace.  And there are just too
many things in the GUI world that assume your background will be a light
color (white), and that it's okay to display dark things on the
foreground.  I understand the whole "paper" idiom, but on a computer
display, I greatly prefer the low-energy state of a dark background.
But usually this is impossible, because somewhere, there's always
something hardcoded as a black foreground.  Or, as is the case for
Eclipse, there are just too many different things that have to be
adjusted.