Windows 7 Start Orb Changer is a free Utilities which can easily help you change Start Orb.
Now it's available to download here. Great idea.
There are 2 files and 1 folder in the download file:
The main executable file is Windows 7 Start Orb Changer.exe
Sample Orbs folder contains some sample start orb bitmaps.
r.exe can be used to replace the start orb bitmaps
How to use the software?
After lunch the main file, click "the Change Orb" button and select the Orb you want to replace. Then click "Start Explorer" button to finish.
The Windows 7 Utilities is very useful for me now.
Notes: It can't run in Windows 7 build 7229.