Art is always one of the best sources of inspiration for designers.
Doug Cooper is an american artist who focuses on large panoramic murals of cities in the USA and abroad. In this post you can discover some of his Pittsburgh series, but check out his website to see more work.
David Marsh must really like seeing the Pantone swatch every time he uses Photoshop or other Adobe products, he even used it to create a new form of pixel art. Via Designboom.