How to hack iCal’s icon, more Mail icons
Kuswanto at Zeusbox has written a snappy little tutorial 
on how to hack iCal’s icon so that its colour matches your theme or replacement icon set but still updates with the right date every day.
It involves digging around inside iCal’s application package, extracting the right icon and either modifying it yourself or using someone else’s. Kuswanto is using the blank iCal icon from the Ekisho system icons replacement set .
The creator of the Ekisho set has also created a set of Mail.app stamp icons:
They come tilted and straight, with and without the postmark. You can download them all in a zip file from the designer’s web site.
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