Here you can find some cool server banners for your server. You can use them or modify it as you like. See tutorial video below how to modify and shit.
Remember that battlelog banner Must be 512x128px - Must be of type JPEG - File size under 500kB or it will not work and your going to see shit! One thing you must know is that the image color can change on tv. If that happens just modify the color you dommy.