Was talking about this today… instead of using one of these gamecard websites that seem to go up and down, who have intermittent service outages, why not use the gamercards Microsoft themselves host? Just copy the below code and change “Gutzman” with your gamertag.
<iframe
src="http://gamercard.xbox.com/en-US/Gutzman.card"
frameborder="0"
height="135"
width="200"
scrolling="no">
</iframe>
Update:
You can use your avatar (your public one anyway): like so:
Or you can use your avatar body like so: