Congratulatons on your sleuthing, blue_dolphin. I figured Kerry would be the first to find the original home of the image - she seems very adept at that.
I agree with Anna that perhaps a picture that has never appeared here before (but related to previous posts by the blogger to be) may be a better way to keep the excitement going for a while longer but this was, though short lived, fun nonetheless.
Eagerly awaiting the Sunday start of this new 'mystery' blog. It is bound to be fantastic! 
(edit: to remove someone's name as it appears that may not be the correct 'answer' after all)
