Okay, I take two squares of different patters or colors, put them rightsides together the draw a diagonal line on one, then sew 1/4 inch seam on either side of the center line. Then cut the block in half on the drawn line. When you open it up you have two half square triangles. Then you take two more squares of different patterns and colors and do the same for them. You now have 4 half square triangles. Take two of them and put them right sides together, but make sure your seam is opposite of where you want to sew. Mark that, sew it, cut it and you have your quarter square triangles.