I was playing around last night and made this prototype for bookmarks. I don't know if anyone else is like me, but I'm often busy reading 3 or 4 books (rotating them of course). Usually something scholarly (e.g. one about the dig discovering the mummy of Nefertiti), something trivial (The Book of Lists), something serious (writings by Spurgeon), etc.
So I made this "set". It's very basic and I didn't go into a lot of trouble to "fancy it up":