How to: "Change your Icons" (Windows XP)
1. Installing Icons
2. Changing Icons with applications
3. Converting Icons (PNG ---> ICO)
4. Where Can I find Icons?
1. Installing Icons
1.1 .PNG
When downloading packs off this site, they can often be in the from of a .PNG. Now as we now, this file type is not compatible when changing icons. IconTweaker fixes our problems. IconsTweaker is fairly easy to use and rather self-explanitory, so no need for tutorial.
1.2 .ICO
Many icons you download will be in .ICO format, the standard format for icons. These can easily be changed. Right-Click on the item you want to change>Preferences. The rest you'll figure out, depending on your PC.
1.3 .PNG to .ICO
Often when you download high quality icons, they will often be in a .PNG format. This is going to be useless in changing your My Documents folder. But there is help! Converticon! This internet app will convert your .PNG's to .ICO, or the other way around.
1.4 Editing icons in Instant Messenger
Ever wanted to change that bland buddy icon in the system tray? Well now you can, and with not too much effort. Here a few quick and easy tutorials:
Modify MSN Messenger Icons - MasterCloud
Skinning MSN Messenger - MasterCloud
Editing your contacts in the list- Nelson (French)
When we want to change icons for say the Control Panel or MSN messenger, we need to use a program called ResHack. ResHack will allow get into system32.dll folder, which will show us all the icons. We can then select what we want to change, it's as easy as that.
BE SURE TO MAKE BACK-UP'S BEFORE EDITING
2. Programs
2.1
Give your desktop a personal look by changing the default Windows icons. You can also modify individual icons of drives and folders to be able to recognize their contents easily.
Using the available themes you can apply set of icons at once. Designers can create themes to share their icons with other people. Many themes with beautiful icons are already included and ready to use.

Size: 2.9 MB
Version: 1.11
License: Free
Language:united_kingdom.png
Author: Joost Verburg
telecharger_crxp.png globe.pngOfficial
2.2
IconPackager is a program that allows users to change nearly all of their Windows icons at once by applying "packages" of icons. A package of icons contains icons to replace most of the common icons on your Windows PC.
What makes IconPackager special is that unlike Microsoft's themes which only change a few icons, IconPackager changes hundreds of icons. Everything from "My Computer", "Recycle Bin", Folders, all the way to specific file format icons such as .doc and .xls files and any other file type a user wishes to use.
REMEMBER, ICON PACKAGER ISN'T FREE, SO A 30-DAY TRIAL IS IN PLACE

Size: 11.56 MB
Version: 3.1
License: Trial
Language:united_kingdom.png
Author: Stardock
globe.png Mirror
3. Convert Icons to .PNG's - PNG`s to Icons
To convert PNG`s to ICO best choice is IconBOX, simply drag and drop the PNG-Files into the Iconbox, it will safe the new ICOs in the folder where the PNG`s comes from.
Check the settings how much pixel your icons will have, as more pixels as more filesize. When you use only max. 64*64 pixel then turn off 96+128 pixel (just waste of filesize) ...
3.1aveiconifier_logo.png AveIconifier
This is a nice little tool that gives the user the possibility to batch-convert ICON to PNG and vice versa (PNG to ICON) by simply drag-'n-dropping the files in/out.

Size:
Version:2.1
License: Free
Language:united_kingdom.png
Author:Andreas Verhoeven
globe.pngMirror
3.2ConvertIcon
This handy little web application lets you convert between PNG and ICO formats without losing any quality or downloading any software.

License: Free
Language:united_kingdom.png
Author: PunkSoftware
Visit Directly
4. Where can I find icons?
DeviantART
CrystalXP.net Gallery
PNG Factory
Thanks everyone for your help and support during the making of this thread. I hope you all find it use full. 