Justin Mezzell is a designer-slash-illustrator living in Orlando, Florida. I like the interesting way he uses geometry to create his work. The sun-blushed colours and gritty textures create a nice aesthetic. Justin is at perfectly at home illustrating weapons, buildings and complicated techy things (that I fear even attempting in my own work). He also creates user interfaces, which you can see more of on his website.
For those of you who like to delve a bit deeper, Justin has a humorous, opinionated blog which I enjoyed reading through and recommend.