from tkinter import *

root = Tk()

red = Label(root, text="Red", fg="white",bg="red").grid(row=0,column=0,rowspan=2,sticky=N+S)
blue = Label(root, text="Blue", fg="white",bg="blue",height=20,width=30).grid(row=0,column=1)
green = Label(root, text="Green", fg="white",bg="green").grid(row=1,column=1,sticky=E+W)

root.mainloop()