Classic game shows would often celebrate Christmas when the time came, at least decorating their set but sometimes having little extras in the actual gameplay.  Some I liked that I can give as examples are:

- Family Feud (I remember the first Christmas celebration for the show in 1976, when GSN reran it way back when.  The set had decorations, and Richard Dawson asked if it was for Alex Trebek's birthday :-))

- Press Your luck would have little touches for the holidays, throwing in some seasonal Whammy animations.

- The Joker's Wild, in its CBS run, changed its bonus game from having Jokers and Devils to Santas and Scrooges.

- I think Card Sharks (Jim Perry) let children play the game. 


Which ones do you like?