Make a t-shirt quilt using eight to 16 old t-shirts measured into squares of 12 to 16 inches, depending on the size of the t-shirt logos. Cut the squares with a seam allowance of at least 1/4 inch on each side.
Use an iron-on interface to keep the fabric from stretching during quilt production. Cut the interface pieces about 1/2 inch larger than the squares on each side, place the back of the fabric square on the side that has dots of glue and iron. Trim the excess once the shirt is adhered.
For 12 squares, arrange four rows of three shirts. Sew the first two squares of a row by placing the front sides together. Sew one side of the squares along the seam allowance. Repeat with the rest of the shirts on the row and set it aside to start a new row. When the rows are completed, lay two rows together as they should appear in the quilt and fold the top row onto the bottom row with the front sides touching. Sew the rows together at the seam allowance and repeat until the rows are completed.
Add four pieces of trim measuring the same width and length of the completed rectangle of shirts plus enough excess for a border. Cut a backing piece of fabric measuring the same dimension as the front. Sandwich batting between the pieces and sew everything together at the pre-existing seams. Hand stitch the edges for a clean seam.