Choosing a Color Scheme
The following link will get you to a great web app for choosing a color scheme:
The color wheel depicts 12 different colors. Complimentary colors are the ones exactly opposite each other, for example green and red. One combination I like is what is called accented analogic: 3 colors next to each other plus the complimentary of the middle color. For example, purple, purple-red, red and the opposite of the middle color (purple-red) which is yellow-green.