Seems to me this would be great for pictures of a house for sale - as one example. So, how did I do it? First, you select the two pictures, then click on the collage button at the bottom. Choose Picture Pile as the top level setting. Under Background options, select Use Image. You can also use the tabs above the collage itself to select an image and Set As Background.
Now, you probably have the background photo also in the foreground. Just select it and click on the Remove button at the top. The remaining image looks best, I think, with a white border to set it apart. Just click on it and click the Picture border option in the middle.
You're done, Create your collage.
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