 There is no mystical significance in the color of Mace Windus light  saber. Samuel L. Jackson (qv), after a jokey conversation with  stunt coordinator Nick Gillard (qv), asked George Lucas (qv) if  he could have a purple light saber to match his favorite color, and  George Lucas (qv) agreed. In an interview on UK TV, Jackson said  he "thought it would be cool".