Manufacturers sometimes avoid licensing fees by creating an "original" theme that was certainly inspired by an existing intellectual property or person. Examples:
Alive = Elvis
Barracorra = Alien/H.R. Giger
Beat Time = Beatles
Black Pyramid = Indiana Jones
Bone Busters = Ghostbusters
Eight Ball = The Fonz
F14 Tomcat = Top Gun
Genesis = Metropolis
Gold Wings = Top Gun
Hollywood Heat = Miami Vice
Jungle Lord = Tarzan
Mars Attacks = Mars Attacks trading cards (1962)
Medieval Madness = Monty Python's Holy Grail
No Good Gofers = Caddyshack
Raven = Rambo
Secret Service = James Bond
Space Invaders = Alien/H.R. Giger
Special Force = Rambo
Tee'd Off = Caddyshack
TOTAN = Aladdin
Vacation America = National Lampoon's Vacation
Can you name others?