Here's a picture. They are about 5" long and flat so they slip nicely into a book without any bulk added when the book is closed.
You've probably seen something similar but called by a different name. Here's what it looks like inside a book.
The motif is just a simple clover pattern with a charm. I found the hooks at Joanns and they only cost about $1.50 or so.
Thanks for asking about them. I'm sure others wondered what I was talking about too!
