The people over at XDA Devs have been modding for a while now, and can achieve all sorts of stuff.
Following on from my FREE Sony Ericsson themes I've done over the years, I wanted to start playing around with my new HTC, and it's Windows Mobile based OS.
My first mod is to replace the icons in TouchFlo 3D. These are the icons along the bottom of the screen, for home, contacts and so on.
The new icons are fairly simple blue 3D ones. The "hover" icon is the same but a little brighter like it's glowing. You can see the icons below.
To download them, simply use this link, and check the readme file in the archive for some notes.