Mandala Fun Adult Coloring Book: Mandala adult coloring books for relaxing colouring fun with #cherylcolors #anniecolors #angelacolorz (Volume 1) Paperback – May 7, 2016 by Cheryl Colors (Author), Annie Colors (Author), Angela Colorz (Author), Global Doodle Gems (Author) Mandala Fun adult coloring books are for people of all coloring skill levels to enjoy and share….