Gluphite is a fairly strong plastic made from glue. It can be used to make a small thin pencil that can be carried on a ring chain or in a wallet. It is cheap and easy to make and give as a gift.
The intro pic shows the pencil on a key chain.
Step 1: How It Works
Gluphite is a simple mixture of Gorilla Glue and carbon graphite. It hardens into a fairly stout plastic that has some interesting qualities including working well as a pencil body and lead.