This 'artistic' effect is recommended after you have imported an
icon from a large image or photograph.
The Smart blur effect 'accurately' blurs an image. To use
this tool, specify a Level, to determine how far the
filter searches for unsimilar pixels to blur and a threshold, to
determine how different the pixels' values should be before they
are discarded.
The effect is applied to the image as you move the slider and
you can see the effect in the
edit area and panel of properties
of the object. Press Apply button to make your changes permanent.