I don't care for them, but I have a poison eye for brown and tan together (brings to mind '70s leisure suits). I also really wonder about the versatility of brown boots for you, since you don't really wear earth tones or muddy colors that would pair well with brown? What colors would you wear these with? Maybe cream or olive green and denim? Intrigued by your description of the blue green ones at Zappos--are you especially drawn to this color palette?
Sorry to be such a wet blanket :).
ETA: Just saw the gray green blue ones--MUCH prefer those, especially given the colors you wear. Just my two cents!
ETA x 2: I have a pair of leather Uggs for walking the dog. I would definitely recommend wearing yours barefoot. That's what the Ugg site says to do, and it has worked best for me in terms of comfort (with socks, your feet slide around and they sweat; barefoot there is no sliding, and the sheep fluff magically maintains a nice temp for your tootsies and there is no foot sweat).