The look of the personal computer has remained much the same for many, many years now. The standard size of most desktop computer components has not changed, no matter how much those products continue to evolve forward with speed and processing power. The size of your computer case is often determined by the form factor (physical size) of your motherboard. It's usually full ATX, or micro ATX - with micro ATX cases being slightly smaller in size than a standard mid tower or full tower case would be.
A couple months ago I had the opportunity to check out the Silverstone Raven 3 case. With the Raven 3, Silverstone took what we've come to accept as the standard layout for a desktop computer case and they changed it all around. The motherboard was rotated 90 degrees, the power supply was also rotated and my hard drives are now found behind the motherboard tray. Despite really throwing people off when they look inside it, Silverstone managed to take what we've come to accept as the 'norm' for computer cases, and they gave it a new spin on life. The advantages here were that it had phenomenal cooling abilities - far better than any case I've used in the past. Why hadn't this design been taken mainstream in the past?
Around the same time as the Raven 3 was debuted, Silverstone also debuted the Fortress 3. The Fortress 3, or FT03 as I'll refer to it by it's product name, follows a very similar concept just for micro ATX motherboards. It's a compact micro ATX tower that's taken the usual internal component layout and flipped it around - much like an ultra compact version of the Raven 3.