SOUTHERN LOTUS Relaxing Mandalas Coloring Book Spiral Bound for Adults Mindfulness and Relaxing, Unleash Your Creativity with Designs

Southern Lotus, Mindful Palette and ColorIt have some gorgeous wire-bound coloring books with nice heavy paper. So far I've enjoyed Relaxing Mandalas and Blissful. It's not the cute style that a lot of people here do, instead it's mandalas and abstract nature art. I love them both so much.