Fresh backgrounds for your Mac from multiple resources.
Kelir is a color picker that sits on your menu bar. It includes Palettes and Gradient as well.
Menubar Colors is a Mac menu bar app that allows for quick access to the system-wide color panel.
Mockup Generator sits in your menu bar and allows you to capture screenshots of your favourite websites and wrap them in device mock-ups. Current device mock-ups: Apple Macbook, Apple Watch, iMac (Pro), iPhone 7 and Google Pixel.