We've recently released this app that let's you make a video call posing as Santa Claus. We have a promotion video on the website: http://www.xmastimeapp.com.
I would love to get feedback from the HN community on this, so we can improve it for next year's Christmas. Direct link to app store for you who prefer that: https://itunes.apple.com/us/app/xmastime-video-calls-santa/id1064761800