Mould a piece of fimo in to a shape. Stick a hole through the middle of it large enough to fit a piece of cord through. Add a crystal and bake in the oven at a low heat until hard.
Cut a length of cord. Fold it in the middle and leave a hoop and then tie a knot. Slip the fimo bead on and then tie another knot. On each tale add a bead, bell or charm and then tie knots to secure that they don't fall off. Simple.