One complaint about Leopard is the faux leather appearance of the interface…
If that is annoying you, then take a look at:
- Big Bucket – Archive – Ripping Out iCal’s Torn Page – How to remove the “Turn page” elements from iCal
- OS X Daily details how to return iCal to the non-leather appearance.
Please keep in mind, that these changes are not plist changes, they modify the actual iCal application. So backup your old ical application before you attempt either of these changes.