Hmm, personally I think it could use a change with something that looks less like actual space.
Actually, depending on how you "look" at space, Hyperspace looks alot like real space.
Perhaps you simply cannot "see" anything in hyperspace apart from wormholes or stars. so instead youre looking through the ships electronic eyes. seeing the patterns of radiation and plasma as they flow and clash.
Totally agreed, the environmental conditions should be different in, well, a different environment. Both nebulae and asteroids should be replaced with something more fitting.
Ideas i had in a few seconds;
Temporary wormholes across the map.
Plasma bubbles that appear, expand in a circle then contract and disappear, dealing shieldable damage to ships within.
EM Radiation that may cause flux, but do make the ships radar detection much much shorter.