I posted this before in a "weird mic'ing techniques" post, but it's worth another shot. If you've got an upright piano that sounds like crap (especially in the high end), put a D112 on it. This helped me out in a live situation quite a bit--feedback went from constant companion to far-off neighbor.
Not sure how it would sound on the studio, but what the heck?
That reminds me--does anyone use a lav-sized mic inside a vent hole on a snare? I've always thought that would sound interesting, but never had the chance to try it.
"...nothing makes a Mackie look more appealing then having a Midas on top of it." - xtatic