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Step 1: Supplies and tools
20 4 inch squares of cotton fabric*
1 piece of cotton fabric approximately 16x18 inches (for back)
1 piece of batting** (flat stuffing to put inside the quilt) approximately 16x18 inches
2 yards of embroidery floss
all purpose thread
sewing machine (or needle and lots of time)
large, embroidery needle
small sewing needle
seam ripper (most likely)
*make sure your fabrics are pre-washed and dried so you are certain the dyes are set and the fabric won't shrink after your quilt is complete
**I like to use a thin, cotton batting which can be purchased by the yard at the fabric store. Buy 1/2 yard for this project (18 inches). You can also purchase polyester batting. Choose a very thin weight (3-5 ounce). Alternatively you could use a scrap of flannel inside your quilt--make sure your flannel is plain (no pattern to show through) and pre-washed.
Step 2: Decide on a layout for your quilt top
If you can't decide on a layout, just start sewing and let fate be your guide.
If you want to do something a little more complicated, now is the time to decide. You could cut each square into half or into quarters or triangles. Note that the more pieces you cut each square into, the smaller your final quilt will be because each time you sew pieces back together you lose 1/4 inch in the seam allowance. See the end of this instructable for a few ideas for modification.