Here is a holographic blank that has been "scrubbed":
The pictures don't show the holographic tape left on the blank very well, but its there. Hard scrub less foil..light scrub more foil. Not sure what to paint, but it will be an interesting experiment nonetheless. By the way....you can do something similar by using black paint and scrubbing the paint off but leaving the color in the textured pattern,then clear then paint...looks pretty cool. Here's one before the clear and paint.