The Puppet of Dorian Gray my thoughts turned to alien grays (as you do).
These are all over the place around here. There's the signpost on the A14 to Hemingford Grey (maybe the resting place of a famous historical alien?) Locally, Greys of Ely are so well assimilated into the community that they run a transport business.
But what got me worried recently was seeing a van with a logo warning of Grays Surfacing. I didn't even know they lived underwater!