New version of colour mapping matches the Launchpad's pad colours even better with the clip colours in Ableton Live.
To install, download the file colors.pyc attached below and copy it to the directory MIDI Remote Scripts/novation, which is a subdirectory of where you've installed Ableton Live.
On a Mac, this is most likely:
/Applications/Ableton Live Suite.app/Contents/App-Resources/MIDI Remote Scripts/novation/