Is there any way to quickly flood an entire layer to a chosen color? Any time I'm not happy with something's color, I always need to wave the brush around the whole area (the brush isn't big enough to surround it all at once, even at its biggest size). I'd like to be able to try several different colors relatively quickly until I find the one I like, without having to tire out my arm every time to get a sense for how it's going to look in context. Is there some feature I've overlooked that can do this?