Here is an idea that's probably been thought by many, but I haven't seen any posts on it. I think Blackholes would be cool as a type of star, with Planets orbiting it. IRL, it is indeed possible for Planets to orbit the structures, though their time is limited. The planets orbiting could be distorted by Hawking radiation, and could have pieces flying up out and into the Black hole. Also, i think the planets orbiting the Holes could have a time limit on them, before they plummet into the endless pit.