For my main PowerBook G4 I use a few things.
The black menubar and windows comes from a theme called Black Mac OS X. That's a theme for Magnifique, which is a Leopard utility that lets you do this.
My icons/dock are an icon set from deviantart.com called Black Gloss 2.1. That can be applied with Candybar.
The three clocks are SimpleFloatingClock, an app which I duplicated twice so I could have three different instances of the clock. I just applied a transparent PNG for the clock face so all you see are the arms, which I colored white inside the app.
I have two Yahoo Widgets, Werewolf Monitor (the moon phase widget) and widescapeWeather which gives me my forecast.
The rest are Geeklets that I use in Geektool 3, which is a System Preferences pane that lets you put bits of info on the screen. Mainly shell scripts that call information, such as the weather, time, date, wifi info, etc.
Lastly, my desktop pic has a feathered black frame around the edges so it appears to meld into the menubar and the dock. I also cut out Audrey Meadows image and placed a PNG of her on the desktop using Geektool right over the desktop wallpaper so it appears that her head is in front of the black bar stripe I have at the top.
You can see my different Geeklets in this screen shot.
Lastly, I have Bowtie which only appears when I am playing music (because I have set it that way). Bowtie is an iTunes controller that you can use to control iTunes during playback. I'm using the Neon theme for Bowtie.
If you want the theme and icons:
https://dl.dropboxusercontent.com/u/1932210/Black_Theme.zip
My desktop customizations (note some of this stuff might not work):
https://dl.dropboxusercontent.com/u/1932210/Desktop_Customization.zip
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