Recent shifts in mobile design means we must also shift our thinking. The use of motion and animation plays an essential part in conveying the personality of your work. Think of your favorite apps and Im sure you can pick out an interaction coupled with animation that makes each unique as well as adding function.
Thinking in motion is becoming more prevalent now but unfortunately these thoughts are hard to get down on a piece of paper. While not being as easy to learn as a pen, Quartz Composer is one of the best direct manipulation tools at the moment to help you breathe life into those radical ideas.