Sometimes our power system lets us down, sometimes because a power pole falls down, and during one a few weeks ago I was on the computer playing with virtual quilt designs, and thought that it might be worth playing with some designs with the opposite of a white out, and so Textile Inspiration Black Out file was started.
Black on white background … a bit stark for me.
Black on old gold is more my style, but might try a couple of others.
Purple on white looks better than black, though not quite a blackout!
A light and a dark of purple works, so maybe just about two shades of any colour should look ok.