Coloring books, once seen only as a pastime for children, have become a growing craze for American adults looking to unwind or test their creativity with coloring pencils.
The trend has spawned coloring parties and clubs where grown-ups get together to color and socialize.
"You feel creative and you're like, 'Wow, I didn't know I could that, that looks pretty good,'" Washington resident Lydia Pesant said at a city library that hosts coloring parties every month.
With thousands of titles on the market, coloring books emerged as the most popular category of 2015, according to Publisher's . . .