Re: Sorry about this, Pimp my P-bass!
First off, I'd put on some straplocks. I know they're not exactly pimp, but they are functional. I would then install a mint pickguard, a Badass style bridge, and some nice tuners. I would also try to figure out a way of shading the maple neck, as I don't like the way the stock MIM maple looks. It's a bit pale for me. That's all I can think of.