Sign-up For Crayola Offers! Signup to get the inside scoop from our monthly newsletters. Get crafts, coloring pages, lessons, and more! Sign Up! You can download the adult coloring pages for free from Art is Fun! that includes geometric designs, a sandcastle, and owl, abstract designs, flowers, Mandalas, mushrooms, and more. Four Free Adult Coloring Pages from Art is Fun! 06 of 14 Coloring Pages for Adults.