I have a certain weakness for old, tacky paperback covers, especially historical fiction covers.
Here's a few from my own shelves:
(Another Jane Shore)
(Set in the fourteenth century)
(A Tudor saucy wench)
(Colonial Australia--note the blonde, brunette, and the redhead)
(Katherine Parr. It's not that old--1980's--but I simply couldn't resist such a mammary cover.)