There are 5.1 mixes of Bounce and This Lleft Feels Right available on SACD (incredible quality, shame the format didn't gain popularity) and you can get a 5.1 mix of Slippery When Wet and Have A Nice Day on DualDisc.

...and ste, creating an upmix is rather pointless - just put the CD into any DVD player with surround speakers and set it to ProLogicII and it will do it for you. It'll never sound as good as a professional surround mix though.