Inline drop targets
Backglass (with mirror accents if theme fits...and nipples... Farfalla for example)
Polished metal ramps
Good music....TX Sector as example
Playfield art that made you stop and stare....Centaur/Sorcerer/Paragon/Flash Gordon (and nipples)
Cabinet art that made you stop and stare.....Bride of Pinbot, Lost World, Space Invaders, Centaur, Xenon