On a flight back from Adelaide, South Australia, I saw this retro liveried Qantas plane at the terminal. I have seen other coverage of the retro paint job, but, I must say, it is much more impressive in the flesh.
I think this is the Retro Roo II - a 737-800 painted up to look like a Boeing 707 circa 1959-61. Here is one of the official promo shots from Qantas.
Qantas Retro Roo II in 1959-61 livery