Made these Half Life 2 icons. Each icon contains size formats ranging from 128×128 to 16×16.

Icons may represent a file, folder, application or device on a computer operating system. In modern usage today, the icon can represent anything that the users want it to: any macro command or process, mood-signaling, or any other indicator. User friendliness also demands error-free operation, where the icons are distinct from each other, self-explanatory, and easily visible under all possible user setups.

http://www.deviantart.com/download/12590960/Half_Life_2_hush66.zip

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