When you like photography, it is pretty common to spend hours researching around the net, finding all sort of photo experimentations, especially via social networks. I met tons of people who were mighty obsessed with that pretty light effect where blurred lights appear in the background of a photo. The thing has a name and it is called Bokeh.
My general opinion on such cases is that you don’t need to abuse special effects when it is not needed (and it’s hardly needed). A clean photo, with a good sense of composition and an interesting subject works almost all the time. But Bokeh is great when you need to add a little sense of magic to your pictures. I find that it works very well when you want to add a special touch in still life compositions or even some portrait. As always it is a matter on what you want to obtain.
Ken Rockwell got a good explanation about what Bokeh is and how it should work. I found quite useful this tutorial by lieveheersbeestje as I often shot with a 50 mm (as in the photo above) or a 35 mm. Care for Macro Photography? This is a great tutorial.