Well, Sandy pretty much covered it!

My understanding of the Mystery Quilts is you get a list of the materials you will need (This much fabric in this many colors.) You can pretty much choose your own colors as long as you have the right amount of fabric. Then a series of clues will be given over a span of weeks. The mystery is you don't know what the finished product will be. I have seen some pretty neat ones, but haven't taken the plunge, as I don't always have the time to sew to keep up with the clues.

Please ask if our explanations didn't answer your questions!