How to change folder Icon?

Sometimes we need to change classical folder icon, it's very easy with this steps :
1- Right Click on the folder you want to change it's icon and choose properties...
2- Click on Customize tab from properties windows

3- Click on Change Icon Button
4- From change icon browsing windows you can choose your desired icon or you can choose one from shell32.dll library and you can get it through "%SystemRoot%\system32\SHELL32.dll"