XDA member Nullstring has released an Icon Changer for WM 6.5 that lets you easily change the icons that appear in your start menu. It’s a simple program to use – open the app, navigate to the icon you want to change and go through the menu to replace the pic. A soft reset is required for the icon to change in your start menu. If no icon appears in the app that means that icon cannot be changed. It’s easy to use and it works.
The XDA thread is here, the download page is here and he’s provided some sample icons as well in his posting over at XDA.