Haven't seen this info in the Diamond forum yet (and I did search).
The original post on xda (
http://forum.xda-developers.com/showthread.php?t=281690) provides registry settings for changing the appearance of VistaHide Battery Guage.
The current version 1.1.1 can be found at
http://forum.xda-developers.com/showthread.php?t=281891
Now, for the Diamond (or VGA screen) specific reason I'm creating this post here:
I've created the necessary registry settings for VistaHide on a 640x480 device, for both landscape and portrait modes and changed the colors from the default red-yellow-green to grayscale. Also changed the height from the default of 3 pixels to 4 pixels. See attached screenshot.
The attached .reg file can be imported into your registry via a registry editor (I use Resco's RegistryEditor). I plan to add some excluded regions to break the bar into 10% increments and possibly play with the colors a bit more, but this will give the necessary registry keys to get started.