Interesting how the multiple "backgrounds" surrounding the composite Doctor's face in that first image resembles (to me at least) regeneration energy or a "zoom: effect for an opening credits sequence.
Has anyone seen the video clip that "blends" doctors Hartnell through Tennant into a composite. Similar concept, but animated.
http://www.youtube.com/watch?v=_BEFOe57kEY
Sincerely,
Bill