I reckon people are taking their kids' pictures off the fridge and replacing them with their own.
Adult Coloring Book Stress Relieving Patterns - Adult Relieve Stress Coloring Book - Aliexpress
Free Adult Coloring Pages - Creative Designs - Dear Creatives
Parenting Roundabout
Work Sucks!: An Adult Coloring Book to Relieve Work Stress: (Volume 1 of Humorous Coloring Books Series by Mark Thompson) (Paperback)
Coloring Books for Adults Seeking Playtime - The New York Times
Get the Funk Out!: January 2016
Adult Coloring Book for Women - Mindfulness Coloring Book with Personal Growth Prompts - Stress Relief Coloring Book for Adults, Coloring Books for Adults Relaxation, Anxiety Color Book for Adults Express Yourself
The Health Benefits of Adult Coloring Books Infographic - e-Learning Infographics
Get the Funk Out!: January 2016
ADULT COLORING BOOK GIFT PACK - 3 Coloring Books Set with Colored Pencils - 2130GP