Adobe Photoshop Touch is a great app for tablets and smartphones that I wrote about before. It has just been updated for 7 inch devices like the Nexus 7, Kindle Fire and iPad mini.
This is a great app for students and educators to use for photo editing and effects and now it is available for the smaller tablets. I happen to love my Nexus 7 and the 7 inch table size, so I'm very happy. The app is $9.99.
Take a look at more information about Adobe Photoshop Touch.