Simple but effective. The duotone site by shapefactory lets you search everyones favourite free stock image library Unsplash but with a twist. You can pick two colors and browse the entire library in a duotone colorway of your choice. It sounds gimmicky, but it’s actually really cool. I find it way easier to pick a bunch of images that will fit a common style without too much extra work! Head over to the site and grab some images with a trendy duotone treatment.