I found this copy of Mauel Puig's Betrayed by Rita Hayworth with a painstakingly hand-crafted nudey cover.
I find a lot of altered erotica PBs, but usually they're going the other way and de-emphasizing the sleaze.
This book is up for grabs. Email me if you want it (for cost of postage).
Also in the book was this bookstore record-keeping slip from the "Loreen Inventory Control System" dated 1976.
Any bookstore veterans ever encounter this? Looks like you fill in a number for the initial order and then mark how many are sold in each successive month. I'd don't envy the poor clerk who had to fill these things out.