Default colors

As a new user, I found the default coloring confusing. red/green for not-covered/covered makes sense, but red for much covered and green for not so much?

I do like the heavy/med/light coloring mode, I haven't seen that elsewhere, but I think it should follow the color convention of the covered/not-covered. May I suggest red/orange/yellow/green for none/light/med/heavy?

(and I'd like a quick toogle for using backgrounds instead of fringes, but that's another story)