Make a T-shirt quilt with eight to 16 old T-shirts that are measured into squares, typically between 12 and 16 inches, so the image on the shirt is visible. Cut each shirt square with an additional 1/4 inch on each side as a seam allowance.
Once the shirts are cut to the appropriate size, add the iron-on interfacing to the back of each shirt. Iron-on interface is necessary to keep the shirts from stretching while they are sewn together. Cut the interface pieces 1/2 inch larger on each side than the shirt square and iron them on the shirt on the side with the glue dots. Once adhered, trim the excess interface from the square.
Next, sew the squares together by placing two squares on top of each other with the images touching. Stitch one side of the squares 1/4 inch from the edge. If there are 12 shirt squares, there are four rows of three shirts and then sew each row to the next row 1/4 inch from the edges. Next, cut four pieces of trim in the same width with lengths that equal each side plus double the width chosen for the border and then sew around the rectangle. Finish the quilt by adding a backing piece of fabric in the same dimension as the front with batting sandwiched between the front and back pieces.