Nobody's commented on 'Bainbo's one:
I've got to say, Sminky, having tried to work it out, I was satisfied when you posted your solution on December 11 that you'd got it right. It's the one that makes the most sense, even if it is a bit of a cheat. It struck me that it was a bit like trying to find the hidden tiger in this picture.
Which I thought was rather neat!
Just remember, you're not looking for the tiger in plain view, you're looking for 'The hidden tiger'!

Cheers
Nigel