Help with Python GUI

from Tkinter import *
import threading

class UIChanger(threading.Thread):

    def run(self):
        config = raw_input()
        while config != 'over':
            button.config(fg=config)
            button.pack()
            config = raw_input()
        print "Quit console input"

ui_changer = UIChanger()
ui_changer.start()
master = Tk()
button=Button(master,text="hello", fg="blue")
button.pack()
master.mainloop()

print "Game Over"