I didn't really wanna keep on after you linked me the improved version, but I do agree, it's an eyesore for me, and draws my attention away from the actual mission, 'roid fields as a skybox are seriously hard to do right, the BtRL one is better still than the improved version of this one, but I'm /still/ not even a fan of that one, mostly, I think because in a situation where a 'real' 'roid field is used, these background ones are lifeless and low resolution, where as the models are high res and 'alive'(moving).
I think you'd be very hard pressed to find one that actually works, especially with a planet behind it, it makes it very......static?
Try not to take these comments as a criticism of yourselves, I applaud you for trying this, because it is ridiculously hard it hasn't worked though, at least not for me, not these attempts.. (sorry).