Periwinkle in the big box

When I started to school, one of the requirements was a box of crayons. I had one of the 12-count boxes with only the very basic colors. I was so thrilled later on when I got one of the big boxes with 64 crayons. It had so many interesting colors - variations and in-betweens. One of the ones I remember was periwinkle. It had an interesting name. It is a sort of blue and is named after a flower.