Are you trying to remember how to get the BACK of your new blocks to look like the first ones you did? If so ... here's the deal ...
First, do as Winnie suggested above:
Cut strips along the width of your fabric. Cut the strips 1/2" wider than you want each of the individual squares to be when the patch is done. [If you want a 12" block, each patch will be 6", so each square will be 3", so the strips need to be 3.5" wide.]
Sew the strips together - right sides of the fabrics facing each other - down the length of the strip. Use a 1/4" seam allowance. Press the doubed strips open, to the dark side.
In our example, your strips will now be the width of your fabric and 6.5" "high". Cut the long strips into pieces that are 3.5" wide by the 6.5" "high".
Flip every other piece, and sew them together - right sides facing each other, and the dark square from the top piece laying on the light square from the bottom piece. Again ... be careful to use a 1/4" seam allowance.
Before you press them open, undo the FIRST FEW stitches of the short seam. Then when you press the patch open, you can press each of the 4 short seams to the dark side. The result is no lump in the middle.