Glue the wooden ball to one end of the dowel. Make sure it will not fall off.
Paint the wand any way you want.
Let the wand dry.
Cut a long piece of string.
Find the center of the string you just cut and glue it to the wand near the ball.
Wind the string around the wand handle criss-crossing the strings as you go.
When you reach the end of the handle, tie the string in a knot.
Glue the knot to the wand, and you are done!