Thanks my-oddisee -- this is exactly the kind of thing. Numbers 5, 7 and 8 are superb examples -- amazing arsehole on no. 5. You're right, this is like the "frog" pose -- hadn't seen that excellent thread, so thank. But it's a more specific version with visible arsehole and feet, so I hope we can keep this going as a separate thread -- I'll certainly post any more as I find them.
Thanks again!