How can i make a flower pot out of an old pair of leather biker boots that were my late nieces?

these are a pair of black biker boots she was killed in a car wreck in march and she loved these boots so i wanted to make something out of them to set on my porch

How can i make a flower pot out of an old pair of leather biker boots that were my late nieces?
Paint the inside with bitumen paint so that they become waterproof from the inside, stops them rotting. make a few hole in the base and put plants in pots in them