Man, I have literally dozens and dozens of customs, it has always been something I have played around with, but it doesn't really grab me as a theme week because I use 'em in pics anyway. In fact I already posted some pics of my customs simply because people asked me to.
Don't get me wrong, I'm not trying to be a wet blanket, if that's what the majority of people want, then go for it, I can always find/make more customs to post. Perhaps a future theme week could be your favourite vehicle/driver combo in action....there's plenty to choose from there.