Ok so in order to change your start orb you will need to download Windows 7 Start Button Changer v 1.0 or for short W7SBC ok so download the link is below
W7SBC
Link http://www.thewindowsclub.com/downloads/W7SBC.zip
Preview of it
Ok next obviously you can not change anything if you dont have the orbs so i have found quite a few and put them together in one file ready to download for you guys
Preview of a few orbs
Start orbs
Link http://www.mediafire.com/?v4a0mfxf8lnmbiu
And finally if you dont know how it work just simply click select and change start button then go to your folder with all the orbs and pick which ever one you want
Example
Then just click open and your desktop should flicker as it refreshes and your orb will now be set hope i helped and hope this has not been posted before
Thanks for your time guys Oh yeah it has 293 orbs