Last month I bouth on amazon the DG10 Cellphone lens kit for my smartphone and among the many lenses there were these ones: the kaleidoscope lens 3 and 6. I took some photos in my garden to test them and I was impressed by the outcome. The overlap of the copied images is smooth and the outcome is better than the droste effect in photoshop.
I used the lense kaleidoscope six to take a photo to a trumper flower, while I tested the number 3 on one of my lilies. I prefer the first lense, the effect is better.