wash so all the chip crumbs and oils are out of the bag - gently dry with a paper towel. Place the bag on a greased piece of tin foil covering the baking sheet and put it into an oven set around and melt to the size you want. Small bags keyrings etc.
Key chains kids can make. Made from shrinky dink paper/plastic found in any craft store. Put a hand print on the paper and write a message in the hand. Pop it in the oven and you have miniature hand keychains. Great Mother's/Father's Day present :)