I have notice that when not given a backgroung color to a button, it has a nice silver like color which it seems very nice.

I want to make a button change color on click, like :
buttonColor = new java.awt.Color(red, green, blue);
and then, i want to change it's color back to this nice default color.
What are the parameters for this color?

Also, it would be nice if we could put background images to buttons.
Is this possible?
I don't mean in drawing panel but for buttons or two state buttons.