This is a 5"x7" card I made using "PhotoScape" a free online photo editing software.
One of it's features is "Make a box" filter, which I've used here to make the flat card look like a 3D box.
After designing and saving the picture (sentiment and Steampunk lady on a brown background) I opened it up in PhotoScape and used the "Make a box" filter.
I then printed off and cut out the finished card and stamped it using HOTP's "Timeless" and "Masculine Collage" rubber stamps, I used Tim Holtz "Walnut Stain" distress ink as I didn't want a sharp outline.
From afar it looks just like a real box yet it's flat! A cool Trompe L'Oeil effect.