You want a good contrast between the background fabric and all the other fabrics (color #1, color #2 and color #3). For the other fabrics (color #1, color #2 and color #3), you can use any 3 colors that you love to work with and go well together. It is best *NOT* to use directional fabrics like stripes. For this project, it is best to use medium to small print fabric. Use a fabric that you can recognize the printed pattern in a 3" square.

Use the background fabric as a focus fab that is busy and has lots of color. You can use it to pull colors from the other fabrics.