I personally don't like the shaking hand boot screen of Nokia phones. Its getting old, people don't like it.
So many people try to google it about changing boot screen of Nokia phone, but mostly sites tell the c2z patch method, which is quite big and complicated method.
If you want to change boot screen of your Nokia S60v3 phone, then i got a surprise for you.
Ok let me tell you how i did this.

Windows Boot Screen S60v3

To change the default boot screen aka startup screen. Just download and install the software below.
Windows Boot Screen
Its tested and working 101% on S60v3 O.S. 9.X.

Change Boot Screen, Anytime

If you don't like the Boot Screen which is included in this Software, then simply follow my steps
Goto C: then boot
You will find a image named startup.gif, replace it with your desired image. Then restart your phone.

Removing or Reseting Default

If you want everything back to original, then Simply remove this software from application manager.

Please Note

Your boot screen must be same as your screen size, e.g. 240x320.
You can use gif animation images.
I don't accept any damage, but i am using my own image as boot screen on my N79 since 9 months. :p