from Tkinter import *

root = Tk()
root.option_readfile('optionDB')
root.title('Canvas Bitmap')
canvas = Canvas(root, width =200, height=160, bg='white')
for x,y,g in ( (10,10,'gray30'), (50,30,'gray50'), (90,50,'gray70')):
    canvas.create_rectangle(x,y,x+100,y+100,fill=g)
canvas.pack()
root.mainloop()