Arteza, a manufacturer of markers, colored pencils, and other art supplies, is offering a free 48-page adult coloring book on their website. You’ll need to provide your address and email after adding the freebie to your cart, but no payment method is needed to check out.
The selection of designs includes florals, abstract geometric patterns, mandalas, and more of beginner to intermediate level difficulty. I’d take advantage of this free PDF coloring book offer ASAP, however, since there seems to be no expiration date listed.