Remove Leather UI from Contacts & Calendar in OS X Mountain Lion
Skeumorphism seems to be here to stay, but if you’re bent on ridding OS X apps like Contacts (Address Book) and Calendar (iCal) of any traces of the stitched leather appearance, Mountain Tweaks makes it as easy as a couple of clicks for OS X Mountain Lion users.
Mountain Tweaks is a free download, just look for the tiny ‘here’ text on the page rather than clicking the blue download/pay button.
Download and launch Mountain Tweaks, click the “Mountain Lion” tab, and then click the “Yes” buttons for both of the Leather entries. Restoring back to the leather appearance is as simple as clicking “No” under the same tab.
If MountainTweaks feels familiar it’s because it’s the sister app of LionTweaks, which serves the same leather UI removal purpose for apps in OS X Lion.
As of now there’s no way to remove the skeumorphic interfaces of Notes or Reminders, but it’s pretty likely those will be modifiable too once someone figures it out.