how to post the xbox360 ava. go to xbox.com log on . go to manage profile and right click on ava and save to pic file.
and for a funny look on how avatars feel when you change them go to youtude.
Spoiler
http://www.youtube.com/watch?v=pboR_UKsjFo&eurl=http%3A%2F%2F1%2Eig%2Egmodules%2Ecom%2Fgadgets%2Fifr%3Fview%3Dcanvas%26url%3Dhttp%3A%2F%2Fwww%2Egoogle%2Ecom%2Fig%2Fmodules%2Fyoutube%5Figoogle%2Fv2%2Fyoutube%2Exml&feature=player_embedded
careful with the kids around this link strong lanuage ahead.