When designing, how do you know what colors look good with one another? The basics of color choice can be studied using the model of a color wheel. Colors opposite on the wheel complement one another. 

Whether you are designing print material, or redecorating your home, a website that can help you determine colors that work well with one another is Colors on the Web. Using the online color wizard, you submit your own base color, and it automatically returns matching colors for the one you selected.