Change Dock Icons

Go to applications [menu where it shows all icons/apps installed in your mobile]  & press options.. 

Then press Edit and you get the screen below.. 

 

This is the place which lets you change all the icons and place them where ever you want, on any page in between the apps. You can create folders and add apps to them as well. 

Some folks using android think that the icons on the dock are permanent and cannot be changed, mind you, in ANDROID, everything can be changed :D So after you press edit, Just hold and drag any app/icon you want on the dock or remove from the dock and place it wherever you want it in your applications.

Click add folder and you can create as many folders as you want in your applications. 
For example: You can segregate your apps the way you wish.. Create folders for IM's, Games, System apps etc etc.