Here are some good apps to Use for Free Choice Assignments.  They are Post Production Apps

Here is one available on Apple Mobile Devices.  It is for Hand Painting (Selective Coloring).  You can download from the App Store.

Snapseed App

Here is a video about Snapseed.  It is a free photo editing app from Google. I highly recommend it.

Here is an album of images I edited with the app.  There are images before the edit shown and the image after using various filters and image enhancement features.

Mr. Lindroth’s Snapseed Samples