I really like this book. It colors nicely in pencil, none of the designs are overwhelming to get into, every page is single side printed, and the paper is pretty decent, quality wise. https://www.amazon.com/dp/1661264107/ref=cm\_sw\_em\_r\_mt\_dp\_1wJLFbY0XKR3P?\_encoding=UTF8&psc=1 (100 Flowers: An Adult Coloring Book, Jade Summers)
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I also really like ColorIt's coloring books for when I want to do something that isn't overwhelming. They're printed on really, really nice quality paper, spiral bound at the top, and perforated to easily tear out. I've used pencils on a couple of things I've done in the one I have, but think it's definitely geared toward a wetter medium, like markers. The pages may hold up to water coloring as well.