Just to include a photo of captured helmets that I just found. It is different to those posted on this thread. This one was taken by Yevgeny Khaldei, the photographer who made the famous Reichstag soviet flag waiving photo.
Have you seen this one?
Verzetsmuseum - Colander and bedpan made from German helmets
Or this post war crime?
MAKING POTS FROM GERMAN HELMETS - British Pathe