This is part of the Single Skein Stuff pattern collection.

From the website:
This stylish collection of less-than-one-skein projects is full of “cheats” and “tricks” that make a little bit of yarn, skill (and time!) go a long way.

Perfect for last minute gifts, we present 4 wonderful ways to use your single skeins and leftover yarn in impressive little ways.

This pattern collection also includes: Evening Bag, Wavy Headband, and Waist Cincher.

The pattern calls for Tili Tomas Disco Lights yarn; any DK weight yarn can be substituted.