Yarn or embroidery floss in the colors of choice
Measure and cut the yarn or floss to the length of the wand handle.
Tie a double knot around the end of the handle.
Wrap the yarn or floss around the wand handle, tightly, until near the end.
At the end start making single knots to keep the yarn or floss on the handle.
© lizzyrc's tutorial was submitted for The Leaky Cauldron Harry Potter Crafts' July 2010 Save Galleons! Why Buy It When You Can CRAFT It? Contest, and was posted with permission.