Changing icon color for JGoIconicNode

IS there any way by which I can change the icon color of a JGoIconicNode in runtime?? thanks in advance

Are you asking about how to change a color in an image? That requires some non-trivial Java2D code.
Or are you asking about how to apply a “wash” over the whole image? That’s easy to do, by filling the region with a partially transparent color. You’ll need to override JGoObject.paint.
Or are you asking for something else entirely?

How to convert the transparent portion of an icon imageee into someother color, once a JgoIconicNode is constructed??

That depends on the kind of image you are trying to display. Try JGoImage.setTransparentColor.