T.J.H. Models has a Kickstarter up and running for Asteroid terrain pieces for your space-based miniatures games.
From the campaign:
Asteroids by T.J.H Models are pre-painted model asteroids ideal for wargames.
Asteroids come complete & ready to use.
Asteroids come in sets of 8, they are various shapes & sizes which are pre-painted ,with an individual flying base & a location socket. For ease of storage & transportation.