Having recently sampled Kings Cross, Blackfriars and Victoria I can say hand on heart that a better way of improving the station environment so as to improve peoples perception of rail would be to avoid dark caves of stations.
Compare
St Pancras Eurostar, Kings Cross, Victoria Eastern side platforms and Maybe Blackfriars
With
Charing Cross, Victoria Western Side platforms, Waterloo platforms near barrier line and the Euston Concourse.
The later are all turned or turning into awful dingy caverns.
Whereas Kings Cross yesterday felt very nice as I got off the train.
The ambience of the station (basically a high ceiling) is far more important than tarted up signs (that get out of date).