Free pattern can be found from website linked above and below.

This might be the most simple crochet pattern that ever existed. These lights where inspired by the Christmas tree lights on the first season of stranger things, and make the perfect decoration for any season, not just Xmas.
The lights are made individually in the colour of your choice, the only stitch used is SC. They are then attached to a crochet chain. These lights can be as long as you like, there is no limit to the length that they can be.

To make these you will need:

DK yarn in multiple colours and black.
4mm crochet hook
Toy stuffing
Embroidery needle and scissors
Stitch markers

Skill level - easy.

All patterns are written using US terminology.