Bokeh are shapes of light in the blurred background of a Photograph. You could alter these light blurs to whatever shape-form you want using some dedicated physical Bokeh Filters.The Bokeh Filter is a simple filter that clips onto the end of your lens.This filter blocks out pieces of light that cause the bokeh (blur) in your images to take the shape of the filter.
check this out for an interesting MIY tip:
http://www.diyphotography.net/diy_create_your_own_bokeh
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