The WKRP DVD art is available. Very simple, but very '70s.
By the way, in watching reruns of The Bob Newhart Show (from the same production company), one thing you notice is that the clothes Bob wore on that show -- the plaid pants, the loud coats -- were very much like the ones Herb Tarlek wore. Except when Bob wore them, it wasn't supposed to be funny (though he certainly makes fun of them now). I guess that was part of what made Herb fun, that he came off as a parody of the worst '70s fashion trends.