I created a video so you can see exactly how I did it.
Keep in mind, if you're careful you can use your mask a few times. I used mine a second time to make this card:
A few other things to think about:
I used a stamped image and sponged on ink to create my background, but this type of mask will work just as well with ink mists and sprays.
I centered a single image, but you'll get an entirely different look if you did multiple images along an edge. For example, a mask with 3 circles along the bottom edge would look cool.
Please feel free to leave any questions you may have in the comment section. Thanks for stopping by!