Thanks for your quick response. I think I understand what you're suggesting (select area, right-click > Existing Effects (foreground) > Apply Toolbar Hue). However, this seems to only work if you have a blank background. I have a solid color background (blue in this example) with a red chase. See the attached screenshot. I was hoping there was a function to 'select all cells of a certain color', then be able to change their color.