Yay, I'm first! I made my bookmark with a Ravenclaw theme in color, using glass beads and organdy ribbon. I had high hopes for my ribbons, but the beads I planned on had holes that were too small for the pretty pretty ribbons. I had to make some changes, but what I ended up with worked just as well.
Final notes, the ribbon has a tendency to unravel a bit and I wanted to keep the beads in place, so I added some clear nail polish to the ends and to the tops of each bead cluster. Works just as well as glue and is much easier to apply.
As for using it... I plan to keep it in a book
.