What you'll need:
Fleece-about 4 12"x12" squares, at most. (depending on the size you want, of course)
Sewing machine (just to make your life easier)
Step 1: Cut material
You will need to cut 4 pieces of fleece; two of each color/pattern.
For this instructable I cut mine into 10x12" rectangles, but any size should work.