Currently using default, though I've created a few static symbols. I'm currently leaning towards Animated - Symbols, personally. I think it would prove very ambitious to animate things taken from game footage, so it is beyond my current scope of work. I know a few talented people that would like to draw some things but I'm not sure they'd be ready to draw the amount I would want in game if I went that route.
Another thought I had, and I like the idea very much, would be for someone in the SCP to enable head ANI's to instead display the Tech Room animation of the ship sending the message. Perhaps this is beyond the engine's capabilities, but I've seen some wonders come out of the source code group
As always I welcome anyone's thoughts and comments.