Custom Art in forge

Is there any way to utilize custom art in forge? basically what i would like to do is create a custom set, that would only have new art for existing cards. The question is, how would i get forge to recognize this new set and default to it for the art? Any help you could offer would be greatly appreciated.
Edit.
I actually want to replace the full card, not just the art. I want to update the images with modern frames and updated rules text. I will be creating the images myself. Again any direction on how to go about this would be greatly appreciated.
Edit.
I actually want to replace the full card, not just the art. I want to update the images with modern frames and updated rules text. I will be creating the images myself. Again any direction on how to go about this would be greatly appreciated.