At last months stamp club meeting, one of our members revisited a bleaching technique. You emboss the image in clear EB on dark card stock, then bleach out the open areas. The embossed area retains the darkness of the card stock. After a few attempts, you will realize that some cardstock will bleach lighter than others. My SU cardstock lightened up very little. This card stock from Paperbilities was the same - I had to use 3 coats of bleach before I acheived this result.
(All stamps SU, green galore, brilliant blue and versamark inks)