To get a signature image that changes all the time, go to this site: http://sig.grumpybumpers.com/ (without the italics)
Now type in a username and password. You don't have to sign up or use your HF account, just input a random username and password, like:
Username:herpderprandom
Password:Yobrahwasup

The reason for this is that a server is created using that username and password. On the next page, put in as many image links as you like into the textboxes, then hit "submit query". Once you click submit query, copy and paste the url link into image tags for your sig. For example, I signed up with the username: "coolbeans", so mine was [image tags]http://sig.grumpyers.com/host/coolbeans.gif[/end image tags]
and BOOM! Each time you or any other person views your posts, it will be a random picture, just like mine!

Comment and show us your sig!

LINK IS FIXED

Nice, been looking for something like that