SW, I am *constantly* changing my icon colors.
When it's full day, I have friendly white, enemy bright yellow/green. This provides the only real good icon readability for me.
When the clouds come over, I can't see white, so I darken friendly to blue if I'm over all land, something inbetween if there's too much water around. Enemy is also hard to see, and I have to play with that color, too.
Around sunrise/sunset, I can't see enemy, so I start playing around with that color. And the friendly white fades to the same color as the sky, too.
At night, I go back to daytime colors, since I can't see the darker colors I need for dusk. But since that lasts only an instant, I have to switch back for dawn. (actually, I've usually logged by this time.)
But the real problem is under cloud cover and sunrise/sunset. Then, it doesn't show the colors I choose, it fades them in a weird way so they look almost identical, unless I change them to vastly different colors. In this situation, though, I can almost be assured not to see one or the other against different backgrounds.
Also when cloud cover is over, I can barely see the radar bars with daylight colors, and most other colors.
I have yet to find good colors to use for anything but full daylight with no clouds.
My eyes suck

anRky