This may not be new but i managed to create an effect that looked like a feeding black hole...
How you do it:
1. Create a new system and open up a black hole (At this point i saved it, and edited the XML files for the black hole to make it black)
2. Create all rings around the black hole
3. Place an Earth directly above the black hole
4. Let the earth gain velocity, then turn it to dust.
5. Speed up the sim! (not too much)
6. The dust should spring out at both poles, creating the 'jets' you see at a feeding black hole.