Adult coloring books, though available in print, are increasingly being offered digitally, via ebooks, digital apps, and coloring pages that can be colored online or downloaded.

Contributing to the popularity of e-coloring books are their de-stressing, relaxation effects and the fact that users’ work-products can be saved and shared. …

A friend of mine, Cynthia, was one of the artists in this one – Coloring Creative Characters: Fun Coloring Pages with Personality. ($12.99)