How do you use these? I've tried using BB-code img tags with the direct link to the image, tried pasting the link alone and it seems that it always converts it into a album view of the image using the forum MEDIA tags instead of a normal signature 
You can't use images in sigs here. I've tried. It's a real shame because these are awesome.
Most boards give each user option to disable signatures. That way those that want to keep things clean can, while everyone else can enjoy the view.