considering they're one of the 3 teams in the L w/o a 3rd uni why not a gold jersey with black trimming, "Grizzlies" written on the front in the team's navy letters?
Here's a picture of an alternate Grizz jersey from the NVBA fantasy league.
Basically the home jersey with gold instead of white. It looks ok in the picture, but I'm iffy on how it would look in real life. The Kings' gold ones are hideous, and anything shiny hasn't really ever worked.