ESA's image of the week archive is nice. A lot of the pictures are false color but you can sort by number of views.

http://www.esa.int/spaceinimages/Sets/Earth_observation_imag...

Planet.com lets you download like 70 highres sample images of ports, farms, oil rigs and cities if you give them a fake email address.

https://info.planet.com/download-free-high-resolution-skysat...

NASA's composite photos of the Earth at night are classic

https://earthobservatory.nasa.gov/Features/NightLights

related, there's Aerial which lets you use videos of the earth from Apple TV as your macbook's screensaver. The readme links to a linux and Windows port.