In my definition bokeh is how you play around with shallow aperture. It could be lights at night, color or subjects. Wikipedia describe it as  the blur or the aesthetic quality of the blur,in out-of-focus areas of an image, or “the way the lens renders out-of-focus points of light. Here are some interesting bokeh photography:

Grouchy | Irawan

Lego Mini Character | Irawan

Autumn Bokeh | Maria Kallin

Welder's Musical Symbols-The dance of light

Welder's Musical Symbols | 人造人間,意慾蔓延

Custom Bokeh | Pointy | Steph Goralnick