Yes, I had meant to say I couldn't resize smaller to fit a larger image into the square.Here's a tip I'll share for those interested in doing double exposures in an app....
What I do is collect as many royalty-free pics as I can that will blend well with my photos or make for a unique piece - trees, leaves, water splashes, glass fragments, etc. Then I just import them into my device, and use them to blend with my original photos.
Fundy: if you pinch OUT on a photo in Diana, you can stretch it and move it around some.
thanks for getting me going on Double Exposures. It is fun to try some new apps.