I know, it sounds like a really dumb idea, and you're going to lose some heat transfer. But does anyone know if putting 2 immiscible liquids in to a watercooling loop works? My thought was that if I add a relatively small amount of something like mineral oil to a water loop, the turbulence in the blocks would keep it suspended in visible droplets. Could create an interesting effect with a bit of dye added to one or both phases, and shouldn't create sludge like the fluids with solid suspensions do over time. Biggest concern I think is that the oil would separate sufficiently to stick somewhere, or coat the inside of blocks, etc. The res would be a bit of an issue since the oil could float to the top, but I think I have a way to take care of that. Thoughts? Anyone tried something crazy like this?