Never again forget your room's paint color choice! On the inside of your light switch or outlet cover, using a permanent marker, just write the paint brand, color name, swatch number on a piece of painter's tape for quick reference. If needed, add the date you did your room makeover. Change the room color? Change the info tape! You can even add a touch of the actual paint in case you need to take it to the paint store to get a color match.
The next time you repaint a room in your home consider painting the inside of your light switch cover with same paint you use on the walls; if you ever need more of that color you can remove the cover and take it in to be matched.