One of the best things about Free Open Source Software is that you not only can tweak the code, you can re-brand it as well. The osTicket platform has been a favorite of mine to track customer support requests. The development community for osTicket came out with a new release of the software recently, here’s where the banner images are located (relative to the install folder) if you are interested in re-branding the software:
/images/… logo-support.gif, and ostlogo.jpg
/scp/images/… poweredby.jpg, logo.jpg and logo2.jpg