Although I haven't jumped in yet, I've been looking at the adult coloring books on Amazon ever since my friend recommended The Secret Garden, this coloring book is thought to be the one that started the "adult coloring craze" or trend. It has sold over 2,000,000 copies! I know how much paper and scissors and glue calm me when I'm working on collage and coloring was always a favorite childhood activity. Are you coloring away stress? If so, what's your favorite adult coloring book? There's a lot to choose from!