When I was in Jackson, a demonstrator named Vita Padalino showed us how to do this technique which she calls "God's Gift of Nature." I absolutely love it and had been looking for cards that use this stamp set.
Zoey and I made these cards together--so even though it looks difficult, here's an easy step-by-step:
1) Punch out the moon w/a circle punch and a post-it (we used 1-3/8"---I think).
2) Place moon on Whisper White and then sponge around it w/different shades of blue, starting w/the lightest first. Remove moon mask.
3) Stamp silhouette image in StazOn or Basic Black.
4) Add white highlights w/white gel pen.
Then you just assemble the card and that's it! If you make one of these, make sure to leave a comment w/a link!!