I have a big thing for bokeh. HUGE. It’s the effect you get when the background is blurred, by using a large aperture. Since I am a night photography junkie I’ve experimented quite a lot with city lights, you can see the results below. How pretty is the heart-shaped bokeh?! I made this using a lens cover with a heart cut-out.
For more info check Ken Rockwell’s site here: http://www.kenrockwell.com/tech/bokeh.htm