Basic ideas:
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Pretty much anything goes! Suit to taste.
However, some common ideas:

Arcade Marquees - Placed directly on walls, framed, and even backlit.
Arcade Posters - Placed directly on walls or framed.
Arcade Memoriabilia - Plush Pac-Man dolls, board game versions of arcade games, etc....
Arcade Flyers - Placed directly on walls, or framed.

Obvious early 80's game memorabilia: handheld electronic games, rubik's cubes, etc...

Authentic gumball machine.
Authentic payphone.
Authentic bill changer.

Old Signage
  Arcade related
    No refund for lost quarters, no smoking.
    6 tokens for a dollar every tuesday!
    Ten Token Tuesdays!
    Play at own risk.





Neon art
  Affordable.
  Wide selection.
  Shop around a great deal... prices vary WILDLY!
  Some will have super-high quality base (for high voltage). Others, not.
  Base will affect lifespan.
  eBay Neon Sign Search