BOKEH

Bokeh describes the rendition of out-of-focus points of light.

Bokeh is different from sharpness. Sharpness is what happens at the point of best focus. Bokeh is what happens away from the point of best focus.

Bokeh describes the appearance, or "feel," of out-of-focus areas. Bokeh is not how far something is out-of-focus, bokeh is the character of whatever blur is there.

Unfortunately good bokeh doesn't happen automatically in lens design. Perfect lenses render out-of-focus points of light as circles with sharp edges. Ideal bokeh would render each of these points as blurs, not hard-edged circles. 

Mathematicians would say the intensity distribution of the blur circles are rectangular in perfect lenses, and good bokeh would prefer a Gaussian distribution. This is one area in which physics doesn't mirror what we want artistically.

(source: http://www.kenrockwell.com/tech/bokeh.htm)

HERE ARE MY BOKEH PHOTOS.. Feel Free to comment ,ask or suggest :)

Manual Setting : BULB & Manual Focus or a very low shutter speed.

I used the bulb setting because I took this photos without using a tripod. But if you really want a vivid picture use a tripod and set your shutter speed and aperture.