I noticed that while most forms as you to upload an avatar, this forum asks for a reference. This got me thinking. Lets experiment putting a rotating sig host into the avatar reference. At first I thought it didn't work. Then I was wrong.
When I add the reference and hit submit, the website retrieves a random avatar, takes it's dimensions, and displays it. Every time a post is viewed, a new random avatar is selected, scaled to the first dimensions, and displays it. Pretty nice. Then I remembered someone (BloodLord?) saying that an avatar helps people recognize your post and I thought, lets see if we can screw with this. So I made some avatars and uploaded them all into the rotating sig host and set it as my URL. The lines help frame the pictures a little, and tie the whole thing together.
And some that aren't in the rotate-er.
I had a lot of Touhou desktops lying around so those worked great. I have no idea why the rotating sig host seems to return the same image on every page of the forum but sometimes doesn't. I like when it doesn't.
I'll play around a bit more. I have a feeling this might be a loophole in the file size limit and I want to experiment a bit with transparency.
From what i can tell, the rotating sig returns an image for a given period of time before moving to the next image. The website continues to reference the image and if the rotating sig rotates while a page is loading then it returns 2 different images. This explains why the same image appears in strings before changing and returning that for a while.