While I was away in Colorado for family business, Ben sent me a script I could work on to keep myself occupied while on the plane.  While it is so nice to have sketchbook pro on my ipad, I really miss the function of having a paint can tool to fill in my drawing.  Coloring it in took a significant amount longer, but then again, I needed the practice in drawing with my elbow, not my wrist.  So I practiced that for like 6 hours of delay of flights.