This is a very cool technique I learned at my last stamp club meeting. One of the latest hot items in the stamping world is the "glimmer spray mist". They have varying degrees of color, and a little bit of lovely shimmer.
The cool accessory to this is a re-useable plastic mask, avail in various shapes... which you can spray over and sponge over. These are a few of my first attempts...it's a shame the scans can't show you the cool shimmery effect. I also used clear glaze on portions of the blue one...I made a very cool one with a fish/sea design... which I have already sent to my Mother for Mother's Day, and didn't get a chance to scan. No worries. I can make another one!
