Book covers - other contents to include

I want to include other material within the box set (or books when sold separately). I have decided I want to include book marks (possibly stickers, fold out prints). After researching book marks I have seen that the design of a book mark doesn't just have to be a simple, one or double sided flat piece. I want to them to be creative, perhaps enabling a way to see what line were you left your reading? Or where exactly you stopped reading on the page? I also want the book marks to include the appropriate pattern (according to which book theyre for).

I like the idea of bookmark becoming more interactive with the reader. This idea of clipping, folding over the page?

 

I had an idea where you would be able to leave the bookmark underneath the last line you read, they would stick together by a magnet that would be attached as strips on the ends. The main side would just have a simple pattern and the other side would be the colour relating to the pattern and front cover.

 

Another idea stemmed from my previous one (left side of page), having the patterns enlarged, forming one side of the folding bookmark.

Also, the idea of using the traditional bookmark format, vertical rectangle with a strip that can move along it. The idea is that you can move the strip to point to the last line you read.
There are also very simple, basic bookmark ideas, having the pattern and appropriate colour on a flat surface (I think these are a bit too simple)

Top right - folded bookmark idea again, but with the strip already part of it, made of acetate so you can place your bookmark wherever is needed so that you can see you last line through a strip of acetate.

 Experimenting a little further with folded bookmark ideas. Triangle shape? Points to line. Forked folded bookmark?

This is roughly how the folded bookmark could work, the thin strip is cut out from the pattern, and the last line you read can be seen through it. Held together by magnets?