I just did a short trip to vegas and back (drove out Tuesday afternoon, came back Wednesday night) for a business trip. The Mojave Preserve area around Mountain Pass had tons of snow on the ground. It was very beautiful and made me wish I had my X and had time to play around off the highway for a bit.
Probably won't be there long, but could be a fun place to hit up. Basically all along Cima Road from the 15, and even around the cinder cones and the old Aiken Mine.