A quick wallpaper I did for a friend.
Have you ever heard of rubrication? When books were handwritten there have been scribes to fill in the parts to be emphasized. These parts were traditionally in red.
What you should learn from this is that you can do a lot of emphasizing using just one color. You do not need to use a whole box of colors. Take the scribes as role models. Or at least remember the red cube when you do your weekly Excel charts.
Do you want to read more on rubrication?