The Bokeh filter is a $10 physical filter for your camera that turns out of focus light blurs in the background into shapes like hearts and stars and spirals (separate filter required for each). It works by magic... or just modern technology.
"One of the fastest growing fads in modern photography is bokeh shapes. Bokeh shapes are shapes of light in the blurred background of photos. These shapes are achieved by using a bokeh filter over the camera lens. Bokeh is a photography term derived from the Japanese word for blurred. Bokeh refers to the unfocused background in a photo. 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."
Of course... when it's cute, it's Japanese. Next there will be a filter that will make your face look like Hello Kitty's or any the other Sanrio characters.