Use a projector either digital or old sloop overhead!
Make every aspect of your banner yourself!
I have one for Kewell, it reflects his roots..... Western Sydney!
If you want to ensure your flags & banners survive beer showers or wet weather, I recommend getting aquaset fabric paint or alternatively get fabric medium to mix with your acrylic.
Still needs more flags, Gotta have bigger and better than the those idiots across town!
If you cant see the game because of the flags ....... move to any of the other thousands of seats!