Pretty ribbon or bias tape
Thread embroidery needle with plenty of thread remaining
Start threading a felt ball onto the thread
Continue threading balls spacing them about 1 inch apart. The balls should be tight enough on there that they won't move. You could always make knots if your felt balls are sliding.
Continue stringing until you have about 6 on the thread. Make sure you're leaving more thread at the beginning and end. Cut each end of thread down to about 7 inches.
Tie one end of the ribbon or bias tape to the end of the thread in a double knot. Do the same to other end.
Tie a pretty bow at the top