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.
Combine light to make secondary colors. Like subtractive color, there are three primary colors, and three secondary colors, made by mixing the primary colors together. The additive light results may surprise you: Mixing red + blue = magenta.