Tired of the boring black and white menubar icons for AirPort, monitors, sound, etc? You can customize the colors by using a combination of Photoshop and Preview -- this thread on the MacNN forums has a general overview of the process.
Basically you need to edit the icons in Photoshop, save them in Photoshop format, then open and convert to TIFF files in Preview. Replace back into the application bundle for the particular menubar item, and you should get a colored version the next time you drag it to the menubar.
Update: In the spirit of keeping everything in one thread, here's a relocated article on the airport menubar icon...
I guess I spend too much time customizing my Mac OS X system, but turning the AirPort Menu Item to all orange was a dead give away for me :) All the images representing the various states of the AirPort network have been modified to be a light or dark orange.
If you'd like to colorize your Airport menubar icon, read the rest of the article...
This almost goes without saying, but you should always have a backup before you start changing system files! With that caution in mind, this is how to change your images for the AirPort menu.
You will need to be logged in as root to do this, it makes things easier, you don't have to fiddle with permissions.
[Editor's note: If you're comfortable in the Terminal, you can also do this with 'sudo' and other commands; those steps are left as an exercise for the more advanced readers!]
First, download the new images.
In the Finder, go to: /System/Library/CoreServices/Menu Extras/. Open up the AirPort.menu package (right click, then "show package contents"). Navigate to the /Contents/Resources/ directory within the package. Now trash (or move to somewhere safe) these images:
AirPort_1.tif
AirPort_2.tif
AirPort_3.tif
AirPort_3.tif
AirPort_4.tif
AirPort_Error.tif
AirPort_Off.tif
Network.tif
Once they've been removed, insert the new images from the file you downloaded into the same folder. Logout and back in again and they should be set. Now you have a color airport menu! I like having a little color up there.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20011022014642236