You can make a Double Slice Layer cake quilt top in one day. It is from a Missouri Star video, and I have made several and like all of them. She uses a layer cake, but I have even made one just from five fabrics, where I cut my own ten inch pieces of fabric.
Let me see if I can find a picture of one from a layer cake and one from five fabrics. I was very pleased with mine, and you might find the idea pleasing to you. ...Okay, the first picture is from a layer cake and the second is five different fabrics. This quilt has 42 ten inch blocks, (same size as a layer cake) but I have made a lap top size with 30 blocks....Um, might have a picture of that too. Yes, found it. It is the purple one.
Here is the site....
http://www.youtube.com/watch?v=jxC-0T5lXw4
Dina