Not sure what software you used for this, but Acidplanet does something like this occasionally. They have partnered with some artists who will put pre-mixed tracks up for downloading, and let you re-mix their songs. Last time I visited they had NIN - "Only" up there. Might be worth a look, but also might be worthless if you don't use Acid.
What is hip?
Gear: Digidesign 003R / Telos Zephyr XStream ISDN codec / JK Audio Broadcast Host digital phone hybrid
PC: HP 6005 Pro MT PC running Windows 7 Pro 64-bit w 3 GHz AMD Phenom II x3 B7, 4GB RAM
DAWs: Sound Forge 10 Pro, Vegas Pro 9, Adobe Audition 3.0, Pro Tools LE 8.04, Reaper x64.