D9P has already been suggested. I made one with 10" squares. That went fast.
Another I made quickly was a brick quilt - 6.5 x 18.5" bricks, and moving the next row 1/3 the way across the first row brick. You could also move the fabrics half way across. I had sorted my fabrics into blue/green, brown/black, and lighter shades of those two groups and made a pattern alternating dark to light to dark to light across the row of bricks. I finished this one in a week while working full time and packing for a trip, including quilting.