We're limited in what we do by cost. We made a decision to re-use a lot of the displays because we invested so much money originally (that display originally would have cost thousands, so using it twice is worthwhile).
We'd love to do some new displays, but we either need to raise funds from donations to pay a manufacturer, or we need volunteers to help us paint something (which has always been a nightmare organising - people say they will help then don't turn up, and it ends up being the same 4 or 5 lads spending countless hours on it -hard work when you have jobs and other commitments).
I agree about the rest of the ground with the atmosphere. I've sat in CBL3 a couple of times this season and you get weird looks for singing/booing/whistling.