Yes, I felt the same way when I found the book that introduced me to BC. I am not a romance reader, and I found a Danielle Steel novel. I had no interest in the book whatsoever, but the idea, on the other hand... :)
Released statesman Lincoln Alexander's autobiography at Alexander Hall, a University of Guelph building named in his honour. Release was done on 21 January, which is Lincoln Alexander Day in Canada. (photo-- book is on the corner of the bench near the sign, it's a bit hard to see in the picture)
Obadiah Comes Fourteen ( https://www.bookcrossing.com/---/14813407/ ), a book set in my area in pre-Revolutionary times, released at a local burying ground from the same era - the burying ground was even referenced in the book!
I think this would count as a themed release... Tonight I bookcrossed a book from the Choose-Your-Own-Adventure series called The Third Planet From Altair. I left it in a book exchange area at a games cafe called The Adventurers Guild. I thought it was fitting as the book itself is a sort of game, and the name of the establishment fits with the Choose-Your-Own-Adventure series.
There are several books in the photo, but mine is the one that is a little out of place-- propped on the ledge at the right side of the fireplace rather than on the mantle used as a bookshelf or in one of the piles on the hearth. http://www.bookcrossing.com/---/14021126