Okay... here's my version... Obviously its not as good as it can be but oh well.. this will have to do I guess. I'm sure Firefox can do something cooler perhaps?
So here it is: (okay, so I know you all are laughing at my gfx skills... lol, it's all right laugh, I'm used to it now
Here's my first idea: A the plain siggy, with no gloss or anything. And instead of just putting 'Syschat' I thought it would be cooler to put 'Team Syschat'... and of course I had to include the moderator part. And it has a bit of transparency as well... so if the background changes it doesn't matter.
A variation of the first one with curved gloss:
And just plain gloss:
And of course, other colours are available as well... and the siggy can be extended to hold your name (no matter how big it is)...