I just whipped this bracelet out last night.
I didn't have time to wait for the bracelet blank to come in the mail (had to mail the bracelet to my grandma for Christmas), so I made it with ribbon instead. I made a button and loop closure, and just glued the ribbon to the backs of the marbles, and then glued felt on top of that. I used pictures of my grandma's 6 grandkids, for an extra sentimental present. I'm also making the marble magnets with pictures of the appropriate kids for my mom and each of my aunts. Anyway, here's the completed bracelet: