Paint is not the only source of color at our disposal. What about paint chips!
Cozy little cave did a stair way spruce with a little paint chip wallpaper. Notice the yellow and white painted stripes on the ceiling leading to the magical stair.
Ish and Chi made a striking color wall composition.
Design Verb has a tutorial for how to make business card holders out of chips.
Scott Prendergast used 500 chips from Home Depot for his color fade wall.