This curious Liquib Droste rendering originated as a photo of a reflective store window behind a metal fence and railing.  In this case, no transparent areas were added to the image.  First, two Spikey Spiral Droste Style objects were applied (without the Full Image Droste option set), one to the upper right, and the other near the lower right.  Then, with the Full Image Droste option set, a third Droste effect was applied with the Droste Style set to Winding Nodules.

The picture below is exactly the same as above, except with Tile enabled, mirroring the image into 4 panes.