User blog:The grey wolf/Chat?

Hello, i recently made a wiki.I have chat enabled but i would like to customize it, is there a way i can do that so Admins have a special symbol like the star but different? and if i can type in something so everytime someone enters the chat it says a greeting, etc.? I was also curious how to get it so i can add pictures on my home page, where it says add a picture i would like that on my home page....