So pretty much: I think unless you have a texture pack glass looks pretty ordinary as the cages. Barrier blocks are completely clear and they could easily be completely removed when a game starts to avoid confusion. It would also make it more significant and special to have a coloured cage because everyone else's would appear to look non existent. It's a really small change but is a simple idea that could improve the game. Now I know there might be a reason to keep them as glass that I am not aware of. If this is the case please fell free to message me in the reply section. Keen to hear your feedback.