Bind them with rubber bands and dye them according to package instructions.
Let set for 6 - 8 hours and then proceed with one of the patterns below.
Braided Headband
Cut a portion of a t-shirt into nine 1/2-inch strips, long enough to wrap around your head. Create three braids.
Connect the ends of each braid individually by running them through the sewing machine.
Once each braid is connect separately, line up each braid and run through the sewing machine again, attaching them to each other.
Knotted Headband
Cut a large piece of fabric from the t-shirt.
With the fabric folded, cut two rectangles 13″ long (along the stretch) and 2 1/2″ wide. Use a rounded object to trace a half circle on the open end (opposite the fold) of the rectangle and cut.
You’ll have two long ovals. Place them right sides together, press a little with some steam if the knit starts rolling over on itself. Use a serger or a zigzag stitch to sew all the way around the ovals. You want the knit to maintain its stretch, so don’t use a regular straight stitch. Leave a 1 - 2″ opening at the center along one side only for turning the headband right side out.
Turn the headband right side out and reshape. Press. Cose up the opening. You can just zigzag stitch on the outside of the fabric since this spot will be at the nape of the neck and won’t show OR you can slipstitch it closed so it doesn’t show.
Wrap around the head and double knot.
Twisted Headband
Cut two long pieces of t-shirt about 6 inches wide; fold in half and sew. Turn right side out.
Measure your head and trim the sewn pieces down. Fold the two pieces in half and cross over.
Sew together each end. Make sure to not sew the wrong pieces together!