I have quite a few, some seasonal, that show up on my modules. My non-Christmas module theme is "cars and vehicles from movies and TV," so I have lots of different celebrities/characters:
Here we have Thelma & Louise cruising past Buddy and Jovie from "Elf":

Next is Sally, Jack Skellington, and Zero from "Nightmare Before Christmas" in front of Drogon from "Game of Thrones":

Here we have Walter White from "Breaking Bad" and B. A. Baracus from "The A-Team":

Next up is Catwoman, Batman, Lilly & Herman Munster, and Grandpa:

This is a busy one, with Queen Elizabeth, Rudolph, Gandalf, Drogon, Harley Quinn, Joker, and an assortment of Minions:

Another busy one here with Doc, Einstein and Marty from "Back to the Future"; Boss Hogg, Rosco P. Coltrane, Uncle Jesse, Luke, Bo, Daisy, and Cooter from "The Dukes of Hazzard"; Al from "Home Improvement"; and Gomez, Lurch, and Morticia from "The Addams Family":

Here we have Sam and Dean Winchester from "Supernatural" beside Scooby-Doo and Shaggy:

Next up is Barney Rubble and Fred Flintstone with Rudolph peeking around the corner:

And "The Blues Brothers" continuing their mission, with Doc and Marty in the background:

Another one with Doc, Einstein, and Marty:

And another one with Bo, Luke, and Daisy Duke with Doc, Einstein, and Marty in the background:

Here we have a local celebrity -- Noah from Kennywood Park's Noah's Ark fun house attraction:

And last, but not least, "Hero Boy" from "The Polar Express":

Kids and the young at heart love picking out all the little details in these scenes. Adding recognizable characters/celebrities to scenes really adds to the fun factor! 
Andy