We all get a little crazy about our hardware now and then. Case modification, overclocking, custom wiring, et cetera. Few of us go to the extent of engineering our own custom design CPU cooler. A clever fellow has designed a rather scary, but impressive looking, custom waterblock, and had a machine shop crank it out for him. It is a multi-channel tiered waterblock, with a cog-work style look and a beef copper base. There are photos and descriptions of it here.
Quite a beast! I'd like to own one. He doesn't post any specific performance specs for temperatures (yet), but I will keep my eye out.