START YOUR ENGINES AND SHARPEN YOUR PENCILS! Because you are going to be burning some midnight oil keeping busy coloring these 47 bold and challenging grayscale 18 wheelers! Cool Custom Big Rig Trucks is a heavy grayscale coloring book in celebration of trucks and truckers everywhere, and features some very awesome big rigs! These sweet semis should be colored with bold and vivid colors to capture the trucks' power and personality! About the images in this book: These images are based on the artist's personal photographs which have been carefully rendered into a semi-surreal style of grayscale. It is a different style of grayscale than those commonly used in the coloring book industry. If you are not familiar with grayscale or have never seen this artist's style, please take advantage of the "Look Inside" feature Amazon offers to give you a better idea of the style of images in this book. This style is not for everybody, but colorists who enjoy the challenge of grayscale images will be surprised at the incredible results they can achieve. For example... take a quick look at the cover of the book in this listing. This front cover picture was colored with colored pencils! This book is recommended for adults due to the detail and unique style of grayscale.