Re: SIN (steam) needs a desktop icon!
What you could do for a temporary fix is change the icon for it manually. After you create a desktop shortcut from Steam for Sin1, right click the shortcut and click on "properties". Click the "Shortcut" tab and then click on the "change Icon" box. You can then browse for an alternative icon of choice. In my case I used the icon associated with the sin executable. It's somewhat buried in the Steam installation folder (in my case this is C:\Games\Valve\Steam\SteamApps\wookiestick\sin 1\sin.exe however you will have to change certain corresponding folders in your case.