READY. SET. RELAX. with Gayle's Grayscale CATS Adult Coloring Book. This coloring book for grown-ups is a fun alternative to the traditional adult coloring books that are usually available. Whether you're a colorist who's a beginner or advanced you've got to give grayscale coloring a chance. This beautifully unique coloring book features: - 25 Grayscale Images to Color - Beautiful Cat Photographs in Grayscale - Grayscale Images That Make Your Colors POP - 25 Single-Sided Pages at 8.5 x 11 - Includes Color Test Palettes to Test Your Colors Before You Commit Them to the Page Each grayscale coloring page is designed with beautiful high resolution photographs, to color any way you want. Simply sit back, relax, and choose the grayscale coloring page that connects with you. Then color in the grayscale image with your choice of color pencil, pen, marker, and/or crayon.