Coolest wedding idea ever, from a commenter to Neil Gaiman.
SHort version in case you don’t want to click: when she and her husband merged their libraries, they had duplicates of all the books they both loved – so they gave one of the extras to each wedding guest as a memento.
What a sweet idea, if you’re marrying someone with similar book tastes. You could even improve on this by having special bookplates made for the occasion.