Just thought it would be a cool idea since alot of people play Halo 2 and play it on Xbox live. So this is how you do it, first go to your stats page on bungie.net
Go to the stats page and search for your gamertag if you cant find your personal stats page. Then you will see your Multiplayer icon right click on it and click "Copy Image Location" then in your address bar simply paste the address. Now you can save the image to anywhere of your choosing. Then simply open up the icon with any image editing program and resize it to the dimensions you want. Then exit, now you have an image you can use on PSU or anywhere else.
Just did this if anyone wanted to get their Halo 2 emblem as an avatar, because some people have pretty creative Halo 2 emblems.