With 25 Mac II's there would be a respectable 400 MHz of processing power. I love the couch, but it needs about 3 or 4 layers of old mouse pads for a seat cushion.
Here's a few more ideas for this ultimate Mac decor room. What if the room lighting came from a few dozen Apple RGB monitors in the ceiling? All of the monitors would be tied to a single Mac through a video signal splitter/signal booster. That way the room's mood would be defined by the color/desktop pattern you choose. (Hmmm... an entire ceiling all running After Dark )
I'd also make a giant clock or sculpture using 60 mice radiating from a central point on the wall. Mounting some keyboards flat-side up to the wall would make nice shelves. And you could make drink coasters for a Macquarium coffee table by gluing together 5x5 arrays of keycaps off of old keyboards. Not sure what to do with all the old 2400 baud modems, though???
G4From128k
by Day: Mild-Mannered Engineer and Trapeze(tm) Artist
by Night: Colonel of Truth, Justice, and the Macintosh Way
Reserve Officer in 68kMLA Cantankerous Coot Contingent
& User of the Hockey Puck Mouse of Radial Symmetry