Edit: you can find a much more detailed tutorial and all the answers to your questions (hopefully :)) here!
No, you’re not mistaken - I have indeed made a Monty Python Ministry of Silly Walks clock! I was inspired by this wristwatch, but that was a bit too expensive for me to buy and too difficult for me to make myself.
So instead I made this on a 20x20 cm canvas, onto which I decoupaged the clock’s face (the numbers and John Cleese’s upper body :P). For the clock’s hands I cut out suitable legs from this image and did a bit of photoshopping to improve the image quality. I then used a harder kind of plastic folder, onto which I decoupaged and afterwards cut out the legs. These I glued onto regular clock hands which I had bought (and later cut off so only the attachment at the top remained for adding the legs to the clockwork). I made a hole in the middle of the canvas, put in a clockwork, attached the hands — aaand done!
Things I bought:
Clockwork and hands
Decoupage glue and brush (and any other stuff needed for decoupage)
Things I printed:
Clock face with numbers and upper body
Legs for clock hands
Other things I ended up needing:
Black marker (for hiding white edges)
Small brush for touch-ups