I really want to have a book exchange party! Basically, everyone who comes brings a book, new or used, that matches the theme. For example, you could have genre themes, like horror, or themes like, "The Book that Changed your Life!"
So I tried to imagine what my invitations would look like for this party...
I created a library card template that everyone is free to steal.
Here is a link to the pdf.
They will print 4 to a page. After you cut them out and trim the sides, you can tea-stain them!