Sixx Design is a favorite among bloggers, and w/ good reason. Their style is daring (how many other designers would think of including photos of Tupac?) and fantastic. Personally, I'm intrigued by their gutsy approach of taking run-down spaces and turning them into design gems, while working together no-less! I love my husband to death, but I'm not sure we could collaborate on this scale.
In April, Sixx Design is releasing a book called Downtown Chic. It will be a great source of inspiration from a couple who are a wealth of information.