It can be a little tricky trying to think of a project for extra sock yarn. It doesn't go very far, so one has to think of something special for small amounts. My husband needed an iPhone case, so I put two and two together and made him one.
I didn't write a formal pattern this time, but here's a brief rundown of the process if you're interested in making one yourself. This case is worked in the round and will look especially nice if you use self-patterning sock yarn. I used Berroco Comfort Sock in Dunedin.
With any sock yarn and the hook size it calls for, chain until the base chain is juuuust shy of the length of the short end of the phone. This will ensure a snug fit. Starting in the second ch from the hook, work 1 sc into each ch in back loops only. When you reach the end of the chain, ch 1. Do not turn. Continuing around to the left, work 1 sc into each of the missed front loops. Ch 1. Sl st into the first st of the round to join. Ch 1 and turn. Work 1 sc into each st around, including the two ch 1 spaces. Sl st into first st of the round to join. From now on simply ch 1 and turn at the beginning of each new row, work 1 sc into each st around, and join each round with a sl st in the first st. Work as many rounds as necessary in order to cover the phone before fastening off and weaving in the ends.
If you need any help, don't hesitate to leave a comment! My husband loves his new phone case and has already received compliments on it, which pleases me greatly. I know you'll love your phone case, too!