End of cabinet storage for keys, sunglasses, etc. That would be sort of neat to tack onto the end of kitchen cabinets. not sure how easy it would be to do on an already existing kitchen though, unless you could paint the cabinets the same colour.
Dividers in the deep space above the oven or refrigerator are an efficient way to storage your platters, cookie sheets, cutting boards, bakeware, etc. Add shelves above the dividers to maximize storage in taller cabinets.
This is genius! Write the name of the paint color and swatch number and date painted on painter's tape on back of lightswitch for each room you paint and even add a swatch of the paint so you can match it if needed.