Matching five colors nicely often involves a balance of contrasting and complementary hues. Consider using a color wheel to find harmonious combinations like analogous colors (colors next to each other on the wheel) or complementary colors (colors opposite each other). You can also create a monochromatic palette by using different shades of a single color. Experiment with the 60-30-10 rule, where 60% of the room is a dominant color, 30% a secondary color, and 10% an accent color. Remember, the context and the room's lighting also play significant roles in color harmony.