If you're an adult colorer looking for some advanced templates to challenge you, then break out the colored pencils because here are 25 free printable coloring pages for adults!

Celebrate the ones that you love with these free printable love coloring pages for kids and adults. Photo Credit: twokidsandacoupon.com ...

Other adult coloring books in the top 25 include the stunningly beautiful pen-and-ink illustrations of “Secret Garden.” ($15.95; King, Laurence Publishing) ...

Entertainment Happy National Coloring Book Day: Adults are finding solace inside the lines Updated: Jul. 31, 2015, 3:08 p.m. | Published: Jul. 31, 2015, 2:08 p.m.

Rahe, 66, used that dollar to buy a coloring book, which she shaded and scribbled in with her birthday crayons to escape childhood stress, she said. “It was a diversion, a de-stressor,” Rahe said.

NEW YORK | Adult coloring books are giving Harper Lee a run for the money on best-seller lists this summer. Dover Publications has sold more than 3 million adult coloring books with titles like "Fl… ...