You can make the following combos using the color wheel as your guide:
2. Colors that form right (90 degree) angles with each other (i.e. yellow and red-orange; blue and violet-red; green and orange, etc.)
3. Colors directly across from each other (i.e. yellow and violet; blue and orange; red and green, etc.)
4. Colors that form a T (i.e. blue, orange, and violet-red; yellow, violet, and red-orange; yellow, blue-green, and red-orange, etc.)
5. Colors that form an X (i.e. blue, orange, violet-red, and yellow, violet, blue-green, and red-orange, etc.)
Since brown is a neutral, it will go with virtually any color on the color wheel. I love to pair a chocolate brown with cobalt blue or fuchsia or bright red—such a fun and bold combo. Of course white, black, and the hues of blue found in denim are also neutrals that go with just about anything.