This week's PPA challenge (http://www.palspaperarts.com/) is a wicked one! Check out the site to see all the wicked, good fun they are having sharing cards in the Halloween theme.
For this card, I went sponge crazy. I started with the partially colored-in tree stamp. Using a combination of Basic Black and Whisper White, I sponged a foggy background over the entire card. Then I punched a 1-1/4' circle and used it as a mask to sponge in More Mustard and Daffodil Delight for the moon. To create the fog effort over the moon, take the edge of your sponge and swipe white across. Finally to complete the card, I added a two step stampin' process with the 'Goblin Greetings' message.