For the record, my personal opinion, images in signatures is a really bad idea. It always leads to people believing they need to create HUGE frickin' image billboards that are nothing more than space wasters, bandwidth hogs, and ultimately lead to forum clutter.
That is why i have not allowed images in signatures. I have viewed other websites and it just gets way to cluttered. Drives me and others crazy.. Would rather see more content then a bunch of useless images