After I installed windows 7 I was looking to make my icons prettier and found those sources for Windows 7 icons
To ensure your applications look up to date and in line with Windows 7, you need to update their graphical style with new icons. Fortunately, Windows 7 icons are no different from those used in Windows Vista. Check out that top 7 sources for quality icons.

1. Download NhatPG 535 Windows 7 Icon Pack

 
Windows 7 icons

2. Download Cheemster  Windows 7 Icon Pack

Windows 7 icons

3.Download ~Freak180 Windows 7 Folders Icon Pack

Windows 7 icons

4.Download RedmondPie Windows 7 Icons

Redmond Icons

5. Download dkszone  Windows 7 icons for Windows XP 

dkszone windows icons

6. Download alkhan Windows 7 base Icons 

alkhan windows 7 icons

7. Download SevenVG Windows 7 Icon Pack

sevenVG

More Downloads

http://www.deviantart.com/download/102529828/Windows_7_M3_PNG__s_by_Mheltin.rar
http://www.deviantart.com/download/111902021/Windows_7_1_Folders_final_no_6_by_gandiusz.rar