You'll need a Yummy 2-Ply gradient set plus a main color to complete this project. We've put together some neutral main colors below that would work with any of the gradient sets.
Pattern:
You can purchase the pattern for Joker and the Thief directly from the designer on Ravelry. This pattern may also be found on the LoveCrafts website. All patterns are sold separately and not included with purchase of yarn.