Fun edits in Photoshop. I used flowers and a butterfly, but you could probably use anything. I love the first two, but thought I would show the rest. I haven’t figured out which types of photos make really great swirls.
Here are the originals that I cropped to 4 x 4. Then I did: Filter > Distort > Polar Coordinates > Polar to Rectangular. Then Image > Rotate > 180. Then Filter > Distort > Polar Coordinates > Rectantular to Polar. You don’t have to crop to a square…the oval from a rectangular crop also looks really great.