Any wedding planner will tell you, God is in the details. It's all well and good to have your Star Wars invitations, the best man dressed like an Ewok and a Star Wars here cake, but you have to have the little details too. Take this awesome lightsaber cake knife for instance.
Use your lightsaber to cut the cake. It is the way Jedi do things. And if you want to make your own, rather than waiting for an old hermit to pass your father's down to you, you can find instructions here.