What about a property you could set in your server that would change the "temperature" of the server - for example, if you set it to a colder or warmer temperature players would move slightly faster or slower! Like the timescale, but it would affect the colorscheme of the server, by making the lighting yellower or bluer. The lighting would be set BEFORE the server starts and couldn't be changed afterwards. And at the melting point of plastic, players would drip and melt with gib animations and die!
OR!
Make a map greyscale or tinted one single color, and all the players change to be those colors too! Useful for film noir scenes in movies. Like a "Funky Air" kinda thing. It would be toggleable on the player menu by admins so they could switch on or off someone's affected colors. Also for TDMS where you want everyone to have the same skin but not the same face, for example.
