Woot second! lol *facepalm* I loved this challenge, and I think I may go on making more bookmarks (like Jan said... one for every book? Buhahaha) along these lines.
At first I'd picked up my embroidery ring and started an embroidered bookmark... but halfway through I lost inspiration for it and decided to work with felt (love it) instead. And I love the Snitch challenge, so... I may or may not be allowed to do this, but here's my response to both challenges:
Just plain old felt with a piece of cardboard in between to keep it firm.
My first attempt (unfinished), on calico, with a layer of batting in between:
SPOILER!!: close up on Snitch stitches

For the ball, I just did a close together line of colonial knots, and for the wings a simple chain stitch for the top and whipped backstitch for the bottom line.

I lined the ball with tiny backstitches, then filled them with colonial knots. The top of the wings are whipped backstitches and I used the satin stitch for the body of the wings.
The tail leading to the snitches are just the simple running stitch.
I have to finish this bookmark! But I don't know how yet... so I'll wait til inspiration strikes. Phew, I haven't touched my embroidery kit in 7 years!
It's a mess!
What I'm going to do with it: Use it, of course. I'll make more to give away, or keep. lol
This was a fun challenge, and I can't wait to see what Ern comes up with *smustles*