The definition of impromptu is something done without advance thought or without a plan. When everyone gets together and decides to throw a party at the spur of the moment, this is an example of animpromptu party. impromptu. an impromptu speech, performance, etc. impromptu.
If you prefer lighter color combinations, then instead of these three, go in for pink, light blue and pale yellow color combinations. Contrasting Color Combinations. By bringing together colors in different color categories, many interesting color combinations can be made.
Too close together and clashing colors may appear to vibrate and overwhelm the viewer. Using Clashing Colors. Common color combinations that use two, three, or four contrasting colors are described as complementary, double complementary, triad, and split-complementary color schemes. The two-color complementary combination usually uses two high contrast or clashing colors.