I guess you have already tried to ChaCha the question? Haha. I had this problem a few months ago, all the images like to logo, forum icons, mood change icon,etc. just disappeared and it probably took me another two weeks to find out that I had accidentally changed my theme to IP Mobile Skin. If you did the same thing, in the mobile skin its the same thing as the normal one but without any images. Just change it back to the default one and there you go. Back to normal. New and sparkly. Next time, Deadmad the question
All the images are replaced with Broken Image Icons, you can click on them but its a hard thing to finding out with icon is which.