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.
Complementary Scheme: This is the most dynamic -- yet simple -- color scheme. Using two hues opposite each other on the color wheel, such as blue and orange, is guaranteed to add energy to any room. Color can also affect emotional responses and create a mood. Greens tend to soothe, for instance, while yellows are uplifting and energetic.