This "Planet" was created using a photograph of a Mosque I took in Abu Dhabi. This is my second attempt at "Planet" art, and I've very happy with the way this turned out. The blue center is water from the Arabian Gulf, then there is a layer of sand, and then the famous Grand Mosque in Abu Dhabi, along with some cranes at the bottom of the planet. Hope you like it!
Here's a link to a step-by-step tutorial. It's actually pretty easy to do if you have a decent landscape or panorama shot to start off with.