Step 1: What you need
1) old pen caps
4) little odds and ends for decoration
5) craft glue/engineering glue
CAUTION: If you are going to use engineering glue make sure you wear eye protection and also have a hanky to avoid inhaling the glue. It is pretty volatile and dangerous to smell. Also take care not to spill any on you hands. Wear some tough gloves made of rugged cloth or the like. In case your skin comes in contact with the glue, apply some oil and soap and use some mild abrasive material like a pumice stone to scrub away the glue. Repeat till all the glue and been scrubbed off and wash under cool running water.