Well, my gameroom is not the largest (far from it), but I am pleased to just have one. The gameroom contains a Popeye Saves the Earth and Indiana Jones pinball machines. It also has a Centipede, Commando and Popeye upright arcade machines.

A Donkey Kong Jr pachislo and an electronic dartboard finish the room off.
I made this clock for next to nothing. The clock itself was picked up at Walmart for $3.00 and painted with Krylon plastic spraypaint. I made the face with various MAME screen captures and put it together in Photoshop.
Left: My Donkey Kong Jr slot with one of my cats perched on it and ready for the kill. Above: This sign has been with me for a long time. It once was screwed into a wall in a trendy restaraunt, but now is hanging on my wall.
Right: Arcade Alley... Centipede, Commando and Popeye.

Below: Hi-Scores for the gameroom. Don't laugh too hard at them.
Right: My Holy Grail... Indiana Jones - The Pinball Adventure. What an awesome pin.. Truly my favorite. Below: More self-made artwork... Pac-Man a la Andy Warhol. My 1up neon sign and the board that hung on my grandfather's boat.. The Jolly D.