Priming

So I'm waaaay behind on my painting. So sue me.

Anyways. I played a lot of Orks in 40k and WHFB back in the days and so I was used to a lot of black primer. I'm very comfortable with black, it hides my mistakes well.

But I'm curious now. I see a lot of gray primered models and white primered models. Anyone out there (hopefully troll players) prime in anything other than black? Can you drop me a link to your work so I can see how it comes out on other people's models.

Thanks guys!