I think you are talking about one of the new techniques featured in Pat Huntoon's newsletter.
Here is a link to the gallery cards:
Gallery at Splitcoaststampers
I haven't done one yet, but it doesn't look to hard too me. If you aren't subscribing to the TJ newsletter yet (
www.patstamps.com), you will need to figure out, how to have an image appear when you pull a piece of cardstock up.