Here's my '88 K1500. It started life as a 1988 GMC SLE Sierra, I've since rebadged it as a Chevrolet Silverado.
Original cab, doors, hood, and driver's side fender. Bed is off of a '94 W/T 1500. Passenger's side fender is off of my '92 Sierra. Grille is out of a '90 Silverado, wheels are off of a 2000 Silverado.
This truck started in 2008 as my daily driver, as of November 2010 it has been downgraded to my work truck. Now has a headache rack, all it needs is the gooseneck hitch in the bed, which is sitting in the driveway so once the bed is cleared out, that goes in.