The only option for signatures is the addition of links, you should see that option.
I have not fully decided yet but I am focusing highly on the links converting as in my signature with the site favicon.
I am trying to discourage BOLD, bright colours etc with a more uniform professional look.
That may change based on member feedback but at the moment it is intentional to keep signatures uniform.
PS. Current users with old signatures will still have the old settings but those will change once modified and eventually we will convert all of them to the new look.
Signatures are 3 lines and 3 links for members and 3 lines with 6 links for verified members