By spring 2015, "Secret Garden: An Inky Treasure Hunt and Coloring Book" - readers go on a treasure hunt to find tiny figures hidden in its pages -- had sold 1 million copies worldwide.

We found the best adult coloring books to help melt your stress away. Shop these top-rated coloring books for grown-ups online at Amazon and Etsy.

The beautifully illustrated "grown-up" historical coloring book, featuring artwork by Jeanne Kosfeld and writing by Kathy Berdan, showcasing 19 iconic Saint Paul parks.

Alison Gary used to go to church on Sunday mornings, but lately she’s embraced a different ritual: staying home and coloring with her 6-year-old daughter, Emerson. These days “I’m… ...

Friends find grown-up coloring kind of dumb. One pal joked she prefers her mindfulness and reducing anxiety to come in a cosmopolitan. Yes, I know it's silly, and no, I'm not hanging my crayon ...

In fact, there are enough of you out there to have made sellout successes out of not one, but two grown-up coloring books by illustrator Johanna Basford. Her first book, 2013's Secret Garden, sold ...

With support for the Apple Pencil (or any third-party stylus) and 3D Touch, coloring feels as realistic as it can be on a phone screen. It’s not as dissatisfying as I thought it might be, given ...

Adults seeking stress-relief grab coloring books; new worry about pencil supply-and-demand By James R. Hagerty And Jeffrey A. Trachtenberg Dec. 27, 2015 4:10 pm ET ...

Artist Goes Outside The Lines With Coloring Books For Grown-Ups We've learned about a secret some of you have — a secret that involves crayons, markers and colored pencils.