Here's a series of iPhone cases to either produce wide grins of approval or disapproving sneers, depending upon the person's allegiances and memories of their first personal computers (both an ancient 486DX Compaq and an iMac in our household). The case above even has simulated vent grooves, SCSI port, ADB printer and modem ports. Someone needs to hack the dial tone to mimic the sound of a dial-up modem connecting.
There's also all five original colored iMac cases, the G4 Graphite model with a faux Zip Drive slot, reset buttons and power button, and a 1st generation classic iPod version with control wheel and a simulated display on back, which may confuse those young whipper snappers who've never known any iDevice without touch capabilities.
Schreer Delights iPhone cases will set you back $44.95.