And while I'm on the subject of those unmentionable things of which the very thought destroys our sanity, here's a cute little plush one. Who's a cute little Old One? Yes you is!

Nit-pickery: this fellow seems to me much more of an Elder One (as opposed to an "Old One", or "Great One", or "Great Old One"), per Mountains of Madness. Radial symmetry, tentacles, sails with which to catch "the aetheric winds".