The theme would probably tie to the new movie, but Godzilla Final Wars is my kids' favorite. Best Godzilla movie ever, almost too awesome for a pinbacll machine would be my only concern.
It has aliens, the legendary Don Frye, the "Japanese Keanue Reeves" Masahiro Matsuoka, a rubber suited Godzilla, and for your consideration, the following monster appearences:
Godzilla
Rodan
Anguirus
Zilla
King Caesar
Kamacuras
Kumonga
Manda
Ebirah
Gigan
Mothra
Minilla
Hedorah
Monster X/Keizer Ghidorah
Varan
Baragon
Gaira
Gezora
Titanosaurus
Megaguirus
Fake Godzilla
Godzilla Junior