The Webb sig was more of an experimental transparent one actually. I usually do use backgrounds, but I thought I would try something new. My current sig (with Hanley) used to have a background, but I didn't like the quality of it after getting it to <12Kb. So I just scrapped the background to save Kb and so Hanley would look sharper.
Here are some of my past sigs that were used on another board. The may seem kind of big on here since everyone is probably used to 400x100.
Not quite sure why these 2 don't have outlines