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!

Over a hundred museums and libraries around the world make coloring books based on their collections for the Color Our Collections program, led by the New York Academy of Medicine.

Coloring for adults is an activity surging in popularity. Commentator Barbara J. King discovers that coloring engages her senses, even easing, a bit, her grief at the loss of a parent.

BioWare's Mass Effect and Dragon Age will soon receive adult coloring books from comic publisher Dark Horse.

Visit the gallery below to see interior pages from the Cursed Pirate Girl Adult Coloring Book. How many coloring books, adult or otherwise, do you own?