Hey Sketch Team!
I’m not sure if I reported this already as suggestion, but I figured it would be a nice topic for the forum. So here we go. 
The Edit > Find and Replace Color action is a very powerful tool. Though, I wish it would support allowing to only change the colors of a selection (either artboards or individual elements).
This is particularly useful in the exploration phase, when exploring different colorings. But of course I see great use in many other cases.
I could imagine that this window has another checkmark option for this, that gets enabled once something is selected in background.
All the best,
Alex
