If you are an iPhone user, I would HIGHLY recommend spending the $1.99 on this app that can be found in the iTunes store. Seriously, you won't regret it. In fact, it may take up the next few days of your life, like it has mine. Consider yourself warned.
And for even more awesome news, Nancy Wyatt created a couple of outstanding You Tube videos on how to use the mask and layering features on the app here. Be sure to check back, I'm sure she'll do more!!
Enjoy your day!!