I adapted the art for the coloring pages of this year's calendar from the early-20th century children's book, Billy Bounce, illustrated by W. W. Denslow, one of my favorites. Since I had to adapt all the illustrations to make coloring pages, it seemed a shame to not share them generally. I decided to produce a free bonus coloring book as a karmic thank-you for such remarkable public domain art, and to promote and further share Denslow’s work. The printable PDFs include all of the full-page illustrations from Billy Bounce, along with a handful of spot illustrations. Pick a full-page (letter) or half-size version that you can print and fold into a little booklet.
You may print & freely distribute this book. My coloring book adaptations are covered for free non-commercial use by the Creative Commons license below. And while they may not be used for commercial work, you can certainly go back to the original source art in the public domain and use that as the basis for any commercial application of your own.