Re: subtlety, I guess that is a personal preference thing. Unlike mayday, I greatly prefer subtlety, as I think the alternative is clearcut boring golf. Certainly not boring in a challenge sense - heck, a driving range is challenging for me - it's just not nearly as interesting.
As for variety, I personally look for interesting, fun, entertaining holes that have a sense of flow. I'm not a fan of imposing varietal or balance constraints like par 3s that box the compass, a balance of left right v right left doglegs, a balance of short par 4s and long par 4s, etc., as I feel it might interfere with the interesting-fun-flow thing. When it comes naturally, fine, but I don't necessarily seek it out.
The Rawls Course fits my bill in spades, but off the top of my head, I don't even know what the variety or balance was specifically like, unless I go through the round in my head again. It was just fun.
* Also, my recollection of how TRC was built was that they trucked in the sand, created the land movement, and then designed the golf course around it, which certainly wouldn't lead to conscious creation as Mike N asks. But I could be totally wrong in this recollection - hopefully Tom will set me straight.