How to customize window's 7

Hai friend's shall i know how to customise the window's 7 by change the icon's and the themes and gadget's .....please reply ............i want the full explanation with screen shot's ...... thank's in advance ..........

here you go

Theme - How to Apply Custom Themes


Enabling Custom Themes - Windows 7


Theme - Customize Custom Themes

Few tips:

You can change the size of the icons on the desktop by holding down "Ctrl" and moving the mouse wheel up or down

You can add a quick launch bar like in Win XP instead of the new "super bar"