Customize SC dialog box style

I'm using SC.warn() and SC.confirm(). I know the dialog box is using the images in sc\skins\Enterprise\images\Window to generate the border.

I would like to know if it's possible to use one set of images for SC.warn() and another set of images for SC.confirm(). I want the border colors to look different.

I can clone the images in that folder and change the color. But I don't know how to make those dialog boxes reference a different set of images.

Similar to the way I override button images using IButton's setSrc("../images/button/button.png").

Thanks.