Since the poll came out tied, I decided based on my and Chruser's opinions to take the signature hosting route. To upload a signature image to use on Zelaron:

1. Choose "Edit Signature Image" in your User CP and upload an image
2. Choose "Edit Signature" in your User CP and specify where you want it to appear (see instructions at the top of that page)

Hopefully this ends the days of redexes, "image hosted by tripod", and "image pwned by iownjoo.com" in sigs.