A BookStackers Imprint

BookStackers
Puzzles

Home of The One Pen Project. A calming monochrome coloring book series for adults who find beauty in black & white and peace in the quiet rhythm of a single pen.

✏️
The Concept

One Pen. One Page.
One Moment of Calm.

The One Pen Project was born from a simple idea: what if coloring wasn’t about choosing the right colors, but about the meditative act of putting pen to paper? Every book in this series is designed to be completed with a single black or dark pen. No color decisions. No pressure. Just you, your pen, and the page.

Each volume features intricate, original illustrations at a range of difficulty levels from beginner-friendly open designs to detailed, hour-long focal pieces. Perfect for mindful mornings, quiet evenings, or any time you need to slow down.

🖊️

One Pen Only

No color overwhelm. Every page is designed for a single fine-tip pen or marker of your choice.

🎨

Original Illustrations

Each volume contains unique, hand-styled artwork spanning botanical, geometric, and abstract themes.

🧘

Mindfulness-First

Designed with intention. A calming, screen-free creative practice for busy minds and tired hands.

Available Now & Coming Soon

The One Pen Project Series

One Pen Project · Vol. 1
For Calm When You're Mentally Tired But Still Wired
Cozy interior and exterior spaces
BookStackers Puzzles
New
One Pen Project · Vol. 2
For Calm When Your Brain Has Too Many Tabs Open
Nature & Garden Escapes
BookStackers Puzzles
One Pen Project · Vol. 3
For Calm When The World Feels a Little Too Much
Landscapes & Architecture
BookStackers Puzzles
Coming Soon
One Pen Project · Vol. 4
BookStackers Puzzles
Coming Soon
One Pen Project · Vol. 5
BookStackers Puzzles
Coming Soon
One Pen Project · Vol. 6
BookStackers Puzzles
Coming Soon

Available on Amazon and wherever books are sold.

Find on Amazon
About the Brand
✏️

BookStackers Puzzles

An Imprint of The BookStackers

BookStackers Puzzles is the puzzle and coloring imprint of The BookStackers indie press. The One Pen Project grew out of a love of quiet creative practice. A belief that you don’t need a full box of markers to make something beautiful. Just one pen, a good page, and a little time for yourself.

Each book in the series is thoughtfully designed, printed on thick, pen-friendly paper, and built to become a cherished keepsake once complete. We hope these books find their way onto your nightstand, your desk, or tucked into your bag for a slow afternoon somewhere lovely.

Stay in the Loop

The One Pen List

New releases, behind-the-scenes peeks at upcoming illustrations, and the occasional giveaway straight to your inbox. No noise, just good stuff.

No spam. Ever. Unsubscribe anytime.