dont ask me why I thought of this...
but say you have an aluminum case, or at least one thats mostly metal. if you have a wc system, and a good pump, but no radiator...what you do is have tubing go pump to CPU, then to all around the case; a couple of bends in the top, down up down up the front, snakes left and right downwards on the side a few times, then comes back in the case from the back through a PCI slit, to the res, which then goes to the pump. obviously the pipes are touching the case every step of the way. how well would this work?
very bad illustration. i seem to have forgot to put the end of the pipe coming into a res and pump too
but you get the idea i hope. Im talking about a POWERFUL pump, a mag 3 at least, since thats a lot of piping.