Reaper creative input needed

I'm assembling the Reaper from Forgeworld. At a certain point they want you to put that hooked rod thingie, which goes on the Raider aswell, in the centre of the model (behind the huge sail).

Well, I thought that was pretty boring!

So I've been looking at banners from enemies or whatever to put there, but I've also got that enormous sail which needs to fit. Do you guys have a good idea?

Any Skaven banners look really cool. They are all tattered and what not. it could hang low looking like shredded skin that was sewn together maybe?