Face on Stamp app for iPads

I was trolling new to me blogs this morning and stumbled upon the blog It is Art Day! from Mrs. Carter's elementary classroom. Follow her here.  She mention a new application she had discovered for portraits in the elementary classroom and I had to check it out.   I'm not sure how I will incorporate it into my classroom due to the fact I will have to solve the logistics of being able to use the iPads first.  The app is easy and will most definitely be a hit with the kids!  Here is my first attempt at Face on Stamp.  My immediate thoughts are maybe using it with a unit on Andy Warhol and create the identical stamp in 4 different colors and creating a 2x2 composition.  Any body else have any thoughts?