We’ve been trying to figure out just what precisely that green banner image from the Official LOTR site is… Jon had the following revealing analysis:

I was just looking closely at the banner image from the official LOTR movie
site which has the heading “You tell us?”, trying to figure out what it is.
I notice that in the right half of the image, if you look closely, you can
see what appears to be the head of a lion sculpted into moss-covered rock
(maybe something at Helm’s Deep? I don’t know offhand
what this would be in LOTR, but I’ve included an enhanced image of this part
of the banner. You probably already noticed this, but I thought I’d pass it
along anyway. (Also note: the image appears to be CGI, and is completely
symmetrical–formed by mirroring one half of the image).

Others have thought this might be a close-up of Shelob… while some just look at it and shrug. What do you think? Tell us in the messageboard.