I love the adult coloring book craze! It continues to amaze me. Apparently it started in France a couple of years ago and the trend continues to grow. If you look at the Amazon bestsellers, there are always about seven coloring books in the top 20.
I came across a course on creating coloring books. I quickly signed up and worked through the materials. I then started creating my own coloring pages. Thus far, I've created two coloring books and I've got so many more that I want to work on.
You can order them online through various retailers or you can order them directly from me.