This information on Persian henna knot work traditions is from: Hennaria: Traditional Iranian Henna Art by Erfan Mahlodji, published by TapDancing Lizard 2002. Two sets of Persian patterns are shown below. You can find many more complex Persian patterns and knot work in Hennaria, at

http://www.tapdancinglizard.com/erfan/hennariapromopages/index.html and http://www.tapdancinglizard.com/erfan/hennaria.htm.