A Jim Henson's Muppets chocolate advent calendar was made by BonBon Confectionery around 2000. They were available through Superdrug stores in the UK.
The calendar shows illustrated versions of Kermit the Frog, Miss Piggy, Dr. Bunsen Honeydew, Beaker and Animal (all based on photographs), and has 25 doors for counting down the days to Christmas with a chocolate treat behind each door, plus an extra 7 doors with chocolates to count down to the New Year.
On the back of each door are line drawings of various characters, that can be cut out and used to play dominoes. The back of the calendar has a cut-out-and-keep Animal photo holder.