ShadowBox is a canvas object which draws a box around something.
1 ShadowBox(self.canvas, name='bigtest', ulx=50, uly=50,
2 width=50, height=50,
3 relief=Tkinter.RIDGE,
4 bd=10,
5 ridgeWidth=8,
6 allowMotion=1,
7 background='lightblue',
8 )
9
Screenshot: