Droste effect is a special kind of pictures that made after editing in Photoshop and give a final touch of droste effect in photoshop you can check Droste Effect Tutorials as well as on how to edit picture via after effects on youtube. It actually give such a look that the picture repeats and repeats in a very beautiful way with one picture links with another having no ending.
Droste After Effects editing
credits: Tim, aka konderminator
Droste Effects Spirals
Droste Effects Eagle
Droste Effects Frames
Droste Effects Glasses Picture
Droste Effects of playing card