Colorists will love getting creative with this big book of Magnificent Mandalas from coloring book creator Kat Mariaca If you're already a fan of adult coloring books, then you don't need me to tell you how relaxing it is to lose yourself in the mindful meditation of planning out your color palette, choosing your medium, whether crayons, gel pens, markers, or even a combination, choosing colors and filling lines. If, on the...