Wacom is certainly keeping up with the pace on mobile devices and apps.
New cintiq devices being released and apps as this one:
This certainly falls under the category of 'messaging apps' .
What you can with it is customize messages to your contacts.
Handmade postcards if you like.
Pick a predefined image coming with the app,buy a pack of the from Bamboo or pick an image from your own gallery.
Jot down a personal message on top and send away!