I recently did some T-Shirt recons for my mom and her church friends, and I got to thinking, "How can I get the most out of the leftovers?" So I took the collars, dazzled it up a bit, and viola a brad new necklace.
Cut the collar off of a t-shirt however you want. (Make sure to cut it out so it is still connected in a circle.
Then just add whatever decorations you want. It will fit over your head as long as the t-shirt wasn't too small for you.