There are so many cool applications out there for , and There is one that I really like- and think you will if you have not heard of it.
It is called
It is an application that works so you can design a background on twitter that really looks professional and also has a great opportunity for you to put some info about YOU on your twitter background.
Check it out.
You will like what you see, and I am sure that if you see the big picture- you will see that it is a great branding tool for you and your twitter marketing efforts.