Happy hearts are knitting! This free knitting pattern uses two 25 gram balls of fingering weight yarn (one ball for each color), specifically the Jamieson & Smith 2 ply jumper weight yarn which can be purchased from Wool Winston! The link to purchase the yarn is here.
The pattern is charted and does require you to know how to carry floats.
Pattern is also available in free pdf form on Ravelry here.