About: Sketch Effects: Butterflies: Coloring Book for Adults (Sketch Effects Coloring Books for Adults) (Volume 1) - Grayscale coloring book for grownups. These aren't your standard coloring book images. They are the kind that are infused with nature, the kind that allow you to color what you see in them. We don't dictate your vision. Every image in this book started as a photograph of a living butterfly. I use soft lines and gray areas, since nature isn't usually hard and black and … [Read more...] about Sketch Effects: Butterflies: Coloring Book for Adults (Sketch Effects Coloring Books for Adults) (Volume 1) – Grayscale coloring book for grownups