Gratisography is different and offers some of the world’s quirkiest collection of high-resolution free stock images, comprised of the world’s best, most creative pictures — images you just won’t find anywhere else.
You may use Gratisography pictures as you please for both personal and commercial projects. You can adapt and modify the images and get paid for work that incorporates the pictures.
This includes advertising campaigns, adding your logo or text to an image, printed in any size print runs (e.g., book covers, magazines, posters, etc.), on your website, blog, or other digital mediums, and on merchandise as long as the picture itself is not the merchandise.
Read full license here