Another wild thing about octopeds is the ability of some species to do very rapid color changes, as shown here:
I've seen video that shows octopeds doing continuous rapid changes, creating a stunning (literally, in the case of prey) animated stripes effect. They also communicate feelings and who knows what else to other octopeds by flashing color. The rapid color change is so fast and versitile that I think that if you could clone octopus skin, and create a digital interface to it, you could use it as a living computer montior.