Stripes
You can do it two ways
First
Lay the t-shirt on the table and grab the bottom edge of the t-shirt and roll it very loosely, forming a long tube. The stripes will be at right angles to the tube.
Tie at one intervals or as far apart as you want the stripes to run. Loop rubber bands or wrap string around the tube a few times and knot. Make sure the ties are very tight.
Or you can fold it like this