I've spotted a few different ways of using the popular slatted dies and one way seems to be using them to make eclipse style cards using two identical stamps or images - also spotted one which used plain black behind an image which had black as part of the design and I imagine this would also work if the slatted cut out was backed with whatever colour happened to be predominant in the picture. Anyway I decided to have a go using my heart slatted dies with two images from an ancient pad of assorted designs because fortunately there were two or three of each still remaining. I centred the dies onto one image and cut them , adhering the resulting 'frame' onto the duplicate (uncut) one making sure it was lined up correctly.. Once the glue was dry I used a square die to cut out the whole thing, backing that with a slightly larger green square. At this point I decided the slatted heart needed a bit of dimension so used the three dies together to cut another heart in white card so that I could glue it behind the patterned one before popping it carefully back into the aperture.. A die cut sentiment was added - job done!!

Image - from pad of images by Lily of the Valley dated 2014
Slatted Heart Dies - Craft Addiction UK
Square Dies - Pierced Noble Squares, Creative Expressions
Die Cut Sentiment - Britannia Dies