You need:

Small amount of yarn (about 20g should be sufficient)
A bangle in a coordinating colour
20 small bells
2 dpns size 3.25 mm or 4mm for double knitting.

I-cord: knit stitches, slide to other end of needle and, without turning work, knit again
Placing bells: Pull the bell up the yarn and hold to the front of work between the two stitches as you knit the second.

Preparation:
Thread the bells on to the yarn. Measure the diameter of the bangle.

Bell cords (make 4):
Make two slip knots around the bangle, leaving a long tail. This is your cast on. Work in i-cord for the width of the bangle, then place a bell. Repeat four times. Cast off.

Finishing:
Take the long tails from all four cast ons, and knot them together at an even height above th chimes. Trim ends. Sew in cast off ends.