Sure, you can go with a fan to cool your PC if you're boring and concerned about things like space. If you're more towards the insane side, you might drool over these ludicrous custom heat sinks.
Given that each sink stands about 16 inches tall, and the whole rig weighs about 11 pounds, it's probably not the most efficient cooling from a practical perspective. That said, it's good at its job; it can handle a TDP of 200W, and with not a single fan. Of course, since these are the crazy project of a mad Hungarian, you can't buy a set for your own rig. But let's face it, you don't have space for those. [FanlessTech]