I would just get the cheap acrylic paint from wal mart,,in the craft section,,
buy a red and dark green,, if the color is too bright,,
put a bit of green in the red,,,,,, and a bit or red in the green to tone it down,,,
when dry take sandpaper and slightly distress it to make it look a bit old,,,
leave unfinished,, or put your finish of choice on it,, acrylic will pretty much take any finish,, even natural oil or fat,,