Complimentary colors face each other on the wheel. Side by side, they make the other color seem more intense. In their purest form, complimentary colors are vibrant and energizing. They are powerful and yet calming. The vibrant color will overpower the pastel if they are used in equal proportion.
Vibrant accents create a nice balance.
Analogous colors are separated by one color on the wheel. These colors create continuity as they share a common color. Use the middle color predominantly and the analogous color pair for accents. They work best if their intensities are not mixed. Brown is a combination of all three primary colors.