These lovely images were created with PSCombine, a random image combiner program. From the site:

I’ve written a program that randomly selects photos from my collection and then combines them with a random opacity and blending mode. Generally, I generate 5,000 random combinations then manually sort though them and select my favorites. About 1 in 150 make the cut.

Only for Windows and Photoshop CS3 or CS4. Download here. via NotCot