Yes, the advertising materials can be found in the member area under: Refer friends > Advertising materials.
The following banners are available for banner advertising, among others:
Fullsize Banner
Size: 468*60
Halfsize Banner
Size: 234*60
Rectangle
Size: 160*160
Button
Size: 88*31
Skyscraper
Size: 120*600
Logo
Size: 139*139
