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.
The system for color most are familiar with, however, is the artists color wheel. It has six main divisions: the three primary colors red, yellow and blue; and in between the secondary colors orange (from mixing red and yellow), green (from yellow and blue), and violet (from blue and red).