I was saying something similar at the start of the expansion - once the North side done, the outside needs a makeover - and it wouldn't have to be too expensive. Lighting can be very effective to make a stadium look better. The gray concrete it quite drab looking but I'm sure something can be done about it.
I don't have any inside knowledge of plans though, just using my own eyes and offering a subjective opinion that the outside would benefit from improvement.
edit - just seen your post about floor (not walls).