The banner should be able to fit into size changes of the forums that could take place in time. Thus, we won't need to look for a new banner everytime we alter our forums.
A statue on the left, Alster Union's emblem on the right and some color gradient in between could be considered. It all depends on your creativity from now on.
Can you give me a render of your logo? Might give it a try.
Edit: Also, since your forums are currently down...what resolution do you want? What colors? Can you give me a SS of the layout it's supposed to fit in?
As said, I'd love to give it a try, but I need more information. I don't want to spend hours on a banner which will be rejected because it has the wrong resolution/color scheme/etc.