Begin by removing the ring at the top of the pendant.
Tighten the ribbon and adjust, if necessary.
Now you will need some beads or charms. I had some remaining from the stitch markers I made last year. Make sure the beads have large holes to allow the ribbon to be threaded through them. I found a small tapestry needle handy for coaxing the thread through.
Tie a knot at both ends of the bead. Remember this is a bookmark, so make sure you don't tie the beads too close to the pendant.
I also tied a knot near the end of the ribbon.
These eight bookmarks cost a total of $8.58 or $1.07 each. If I had purchased the materials at full price, I would have spent $22.98 or $2.87 each.