The materials: Cotton yarn (hot green, my favorite color, and lavender), funky Wal-Mart button in my stash forever, and thread.
The process: I had to crochet the bottom of the "cuff" together, which I did with a simple single crochet. Then I made the loop closure with a chain stitch, sewed on the button, and voila! Now my cell phone is cozier than I am.
The cost: Pennies.
Maybe with the ridiculously cold temperatures we've been having, my cell phone needs a cozy. Check another thing off of the list, too. I like it!