Windows 7 Start Orb Changer is a freeware from door2windows that allows you to change your start orb/button with just one click in Windows 7.

Download:
http://www.door2windows.com/windows-7-start-button-changer-change-your-windows-7-start-button-with-one-click/

Features:

Allows you to change the orb in four different ways:

Context Menu

Drag & Drop

Change Button

Command Line (Syntax only contains orb location)

Works with all DPIs (If the orb is too big or too small it will automatically resize it)

Works with both x86/32-bit and x64/64-bit

Works with both PNG and BMP file formats

Can integrate with desktop context menu

Can integrate with PNG and BMP file formats' context menu

Allows you to change the orb in two different methods:

Memory Patching - Edits the start orb in memory which doesn't cause any UAC prompts

Resource Editing - Edits the start orb by replacing resources of %windir%\explorer.exe

Easy-To-Use & clean interface

Two modes for normal and advanced users

First & ultimate Windows 7 start orb changer available on the net