A few knitters are among the brave souls on my friends list; you folks should take a look at the work of
this guy. He's a friend of Dr. Wife's, so I've met him a few times, but I'll withhold his name since he seems to be trying to be anonymous on his (anti)blog.
Look closely at the reversible double-knits, and take the time to click on the links to detailed photo links. The two sides differ in ways that are not possible in traditional double-knitting; sometimes he manages to put two completely different patterns on the two sides.