My Twhirl Twitter Client Theme
I think Twhirl is the best Twitter client (even better that its bigger and newer brother Seesmic Desktop) and believe me when I say that I’ve tried and tested nearly all the Twitter clients for Macs.
The default themes that come preinstalled with Twhirl are not brilliant so I thought I’d have a stab at it.
Here’s what I came up with:

Click here to download the theme file: zander.xml
Instructions for changing theme:
Mac:
Exit Twhirl if you have it open already.
Find your Twhirl app wherever you’ve installed it on your system (Usually the Applications folder). Right-click the app and click on ‘Show Package Contents’

Once the new folder opens, navigate to: ‘Contents > Resources > colorschemes and move the ‘zander.xml’, that you downloaded, into the ‘colorschemes’ folder.
PC
Exit Twhirl if you have it open already.
Move the ‘zander.xml’, that you downloaded, into C:/Program Files/twhirl/colorschemes folder
Mac & PC
Now open Twhirl, go to your Account Manager / Colors , and select ‘Zander’ as you new theme.