I saw this on Instagram and was instantly in love! Bethany from Park Avenue Knits was kind enough to answer some of my questions regarding what I need to do with the white yarn inside. I wondered if it was carried along or cut each time. She confirmed that it was carried along. Of course, I didn't want to ask for a pattern. I was grateful enough she even responded to me! I find it difficult to find patterns online for knitting.
I had blue yearn but needed the white for the hearts. So I made a quick yarn run... that usually means I end up with more than I planned for!
(update: I made a purple one and it includes the (free) pattern here)