Simply scan your fabric, load the image into the swatch builder, and voila - recommended colors magically appear, complete with the names of the coordinating solids, threads, or Hex Values! There are six dots on the picture that you can move around to pull in whichever colors from the image that you like.
In the past, a fun exercise for me has been to pick a palette of Bella Solids I love, then walk around the store looking for prints that match. This will make it even easier to build a great palette for a quilt. For added fun, you don't have to limit yourself to building a palette based on fabric swatches! I am currently getting ready to make a quilt for my parents, who are gardeners extraordinaire, so I found a photo of a Farmer's Market, uploaded it, and moved the dots around until I came up with a combination that looks fun. Now I'll start looking for fabrics in those colors and hope that the final feel of the quilt will be garden-y.
Head on over to Moda's Blog and Select "Palette Builder" at the top to see for yourself how quick, easy, and FUN this tool really is!