I made these two "room" cards, mostly using Photoshop to edit the elements from clipart. I'll try to find the blog that inspired this style of card and post a link as they really are impressive. They fold up and fit into a flat envelope and are really quite simple to make.
I used silver gel pen for the snow on the trees and the window on the card above. The pond has clear embossing powder on it, with white puff embossing powder around it for snow.