Bitmap Coloring Book?

Is there way to use *bitmap fills *instead of solid colors for the Coloring Book
by Zelwyn?

I want to color shapes with bitmap fills. If the user changes his mind, then he could recolor the shape with a new bitmap.

It would be the exact same as the coloring book, except using image bitmap fills.

Anyone have a clue or has stumbled across this on the web?

http://www.kirupa.com/developer/mx2004/coloringbook2.htm