The experience of being on a great server is really determined by the quality of the server's connection (Do players have a good ping? Is it laggy?) and the quality of the admin (Are good maps selected for rotation, are players being kicked for being offensive or disruptive and not because of personal issues with the admin, etc.) Changing things like textures isn't possible from the server side, and even if it was, it wouldn't make the server "great", just "unique."