If the Monastery were to randomly change templates on me, I'd stop using it. Your users will do the same, unless they are design schoool wankers. Sure, it might not be a bad thing in *every* situation, but it's sufficiently silly that I'll still assume it's a bad idea in any particular situation until you can prove otherwise.

Your users' experience level is irrelevant. Your users' age is irrelevant. It wouldn't be creatively different, it would be stupid.