I've been stuck on octopus related things lately (like the hedgehogs)and had to do a nail design. I tried to get the sort of tentacles like the ones in old drawings of ships being engulfed by sea monsters.
I used a detail brush to do the tentacles and a dotting tool for the suckers. I'm planning on trying more designs with the whole octopus on the nail or maybe or a squid.
Here's the polishes I used:
Sally Hansen surely ivory
pure ice french kiss
Sally Hansen double duty base coat
N.Y.C top coat