I grew up near the ocean, and actually lived for a while in the South Pacific, so I really like Coloring Ocean Mandalas. It has lovely designs, all in a circular style, and is good for relaxing. But mostly I enjoy the various nautical designs and themes throughout. My favorites are those with mermaids, sailing ships, and surfboards. I suppose my favorite though is one with waves and small fish, in a yin-yang spiral.
The book is softcover, and not too big to carry or bring with you. The designs are consistently drawn, lovely throughout and really enjoyable. I use my sharpest colored pencils for these since most have fine details, so I enjoy that, too. I found this to be a truly delightful all-ages coloring book, and I hope that illustrator Wendy Piersall publishes more soon!