This pattern reminds me of the pedals on an iris and the color Alizarin, is based on the pigment utilized in paint. It is single pigment with a deep transparent of red. Yet, Alizarin has a warmer undertone and is closer to the bluer side on the color wheel, with a more vibrant look.
With this pattern, you can vary in sizes, by just adding a few more or less of the pattern, but just make sure to end on the 12th row.