While you can use the images for almost anything, the website restricts to redistribute Gratisography pictures, including on other stock (paid or free) sites/apps. Download from gratisography.com ...

It's a paid application that you can install on Windows to get live ... you can create dynamic web apps using HTML, CSS, and JavaScript that can serve as animated wallpapers on your desktop.

Surprisingly, the unreleased wallpapers also include Live designs ... but you can liven up your desktop thanks to a third-party app.