U don't have to stick to just Mickey Mouse shapes, u can use hearts, etc: see other photos with hearts on Christmas trees./Mickey Bokeh for Night Photography at Disney World - Step-by-step instructions on how to make one for your camera
Another great CHEAP thing I use in pictures is white foam board. You can notice in this homemade granola picture I used the foam board behind the yogurt parfait I was photographing. It not only served as a great backdrop, but it also helped to bounce the
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Open up your aperture. Who doesn’t love Christmas light bokeh? In order to achieve this you need to have your aperture pretty wide open. Photo taken by Megan @ Individuality This shot makes me want to get a nice shining ornament just so I can do this :O)