Adult coloring books on themes such as undersea life, the world's greatest cities, "Outlander" and "Game of Thrones" are hot sellers in craft stores and bookstores. Tweens, teens and adults are ...

Coloring books, once the domain of kindergarten crafts and rainy day pastimes for bored kids are now actually one of the hottest activities for grown-ups. Book stores are filled with them. On Amazon, ...

Many times, coloring inside, or somewhere in the vicinity of, the lines is all it takes to channel and calm a child’s chaotic energy. Turns out, the same thing goes for grown-ups.

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.

Grown-ups find coloring books a break from stress This photo taken Nov. 20, 2014, Diane Lazor focuses on a page during an adult coloring night at the Market 65 restaurant in Columbus, Ohio.

Which raises the obvious question: Can coloring seriously be considered a spiritual practice? Some might scoff, but "it can become more than just coloring, if you want it to," said Sybil MacBeth ...

At the time, coloring for grown-ups wasn’t exactly the trend it is now. “I pitched [my publishers] a coloring book for grown ups . . . They were understandably a bit skeptical,” said Johanna.

Hundreds of coloring pages for grown-ups can be downloaded from the Internet at sites including Pinterest. Scores of books are sold online and in bookstores.

A self-proclaimed “coloring enthusiast” since childhood, Newcomb created the Color Your Way concept “in order to bring coloring for grown-ups out of the closet and into the cool, mainstream ...

However, judging by the success of Johanna Basford's coloring books for adults, 2013's Secret Garden and this February's Enchanted Forest, this is not an activity exclusive to children.

: Other coloring books aimed specifically at grown ups which we’re totally ready to buy, include: Outside the Lines Coloring For Grown-Ups ...