I’ve recently organised an event where 31 scratchboard artists each did a piece of art and I drew their names randomly so that they could send their piece to someone, and receive a piece from someone else. It was very successful and can be seen in this thread at Wetcanvas

http://wetcanvas.com/forums/showthread.php?t=617511

My piece went to a friend in New York State and is below.

The entire piece has been scratched with the use of sandpaper and a fibreglass brush, and then coloured with watercolour