RareCarParts.net and TrendyStyles.net aren't horrible names in my opinion... .coms would, of course, be much better, and if someone planned to develop an actual business around either of these concepts, they could probably acquire the .coms for a resonable price as long as the owner didn't have unrealistic expectations...
Military santa could be a very nice idea. Website with instructions on how to send chrismas gifts or donate money for chrismas gifts to our troops. Charity type of thing and only seasonal use, not much value as a domain sale, I assume...