Gleb Kuznetsov is a Russian designer that comes up with pretty gorgeous UI pieces for apps and web. He's got a pretty awesome portfolio with many great examples of how beautiful an interface can be. Check it out! Here you can see a brief selection of his work.
Nick Franchi is the Art Director at Super Top Secret (Take a look at their stunning site) based in Park City, Utah. When I do love about Nick's work is his versatility from web, typography, 3d and more. With the demand nowadays, multidisciplinary skills for a designer is highly recommended for a proper and successful career. It's important to explore different fields of design, not to stay in your comfort zone.