How to remove AddressBook book-like interface or enable debug menu?
This osxdaily.com post let me to LionTweaks utility to do the job. It seems that LionTweaks launches installers that are originally from macnix.blogspot.nl.

LionTweaks version 2.0.2 on 10.7.5 give me back the old aluminium/grey/10.6 look for iCal although the top text has a yellow/brownish shade.

Address book becomes grey but still feels like the 10.7 address*book*.