from tkinter import *


def bg1():
    root.configure(background="blue".format(clicks))

def bg2():
    root.configure(background="red".format(clicks))

def Clicker():
    global clicks
    global flag
    clicks += 1
    root.title("Clicks {}".format(clicks))
    if flag: bg1(); flag = False
    else: bg2(); flag = True


clicks = 0
flag = False
root = Tk()
root.geometry("400x200")
root.configure()
but = Button(bg="grey", width=30, command=Clicker)
but.pack()
root.mainloop()