Making Icons and Integrating
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icon tells Steam where the icon can be found; In this case, in the resource folder: resource\game It should default to looking for icon.tga
Making an icon for your mod
For the icon of your mod to show, there are two places it can be displayed: In your steam library and on your desktop. (right)
To make your icon you will need either:
Making the Steam Library Icon
To start open an image editor and create a new file with the dimensions 256x256 pixels. Then save your image as a .png in a folder (For example sourcemods/resource/icons_raw/) and name it icon_huge.
Copy the icon_huge and rename it to icon_big and scale it down to 32x32 and do it again but name it icon and scale it to 16x16.
After creating the icons, Open the icon file and save it as a targa file (.tga) in the sourcemods/YourMod/resource folder, do the same with icon_big and NOT with icon_huge.
Now once you have done all of that, the next step is to show the icon in the steam library. Go to your mods folder and open gameinfo.txt.
Below game, title, title2, and/or type, type icon "resource/icon", example:
"GameInfo"
{
game "My First HL2MP Mod"
title "HALF+LIFE'"
title2 "deathmatch mod"
type multiplayer_only
icon "resource/icon"
nomodels 0
nohimodel 1
nocrosshair
...
Now save and restart Steam and your icon should appear in the library.
Making the hl2.exe Icon
Note:You may need to restart your computer to be able to make the icon visible on your desktop.- Take your 256px icon and save it as an interlaced .png.
- Find a .ico converting website and make convert the .png to .ico.
- Download and save the .ico in
\steamapps\sourcemods\MODNAME\resourceas "game.ico".
Now you can 
the mod in your steam library and create a desktop shortcut.
Editing the icon with XBLAH's Modding Tool
The mod icon can be edited with XBLAH's Modding Tool through a comprehensive UI without requiring the modder to mess with text files or resources.
Where to find it
This can be accessed within the tool through Mod > Game info.
How to use it
Right click the picture box next to the Icon label and click Load. Select the file path and extension and the tool will generate the icons at the correct sizes, add them to the resource path and update the gameinfo.
