I think it would be good if you create a short long banner. Similar size to the "bluemoon thanks Sheikh Mansour" but one that your and fans around you can hold. As well as that just more and different shapes/ sizes. If all the banners were the same size it would look artificial as if the club organised it if you know what i mean.
[youtube]http://www.youtube.com/watch?v=USB_GDGQpas&feature=related[/youtube]
If you look at that video, whilst most of the flags look similar, but they are all different sizes and it looks better. To be fair as well your banners that you held up with the poles are probably about right, maybe the club could donate you one of those big flags they wave before games. :)