I feel, that signatures allow a little creativity of ones own equipment.
I belong to a few computer forums and they allow for a larger signature with img tags. They also allow for a avatar. However I say we could get rid of the pic in user bio.
Here are a few examples.... Granted these are from computer forums.
And all here would be more into making their sig more geared to A/V.
Plus it will give me time to brush-up on my graphics skills.
Here is the size madonion uses
Click on pics below....