I've been wanting to use this effect since I found out that Adobe stopped working on the plugin and no longer available for CS5 and later. To my surprise there is an app for IOS that uses this effect, though it has its limitations. The app is called Hyperdoste. It is a fee based app but worth the money in my opinion.
Droste Effect is an image that appears recursively within itself. I'm using a surreal self portrait in this experiment.