The fun fact is that Germans do not decorate their houses with the decorations which Germans sell to tourists as "German Christmas decorations".
Germans decorate a lot with elks. Elks are very popular throughout southern Germany and Austria as home decoration and not just at Christmas time but throughout the year. Photo #1 is pretty typical of modern German Christmas decorations.
There's a very famous store with shops in Heidelberg and Rothenburg ob der Tauber (the two biggest tourist attractions near to where I live) called Käthe Wohlfahrt.
They sell Christmas decorations (like photo# 3) to Asian and American tourists all year round.
My mother was the queen of Christmas decorations. She would decorate the entire house and almost every surface of it.
Growing up we had one Christmas tree, but once she retired, she expanded to have a total of 7 trees. They were everywhere: small ones in the guest bathroom, in the kitchen and on side tables in living room and den in addition to the full-sized ones in those two rooms as well.
I contributed to her decoration obsession by giving her a traditional hand-made nutcracker or incense smoker figure from the Erzgebirge in Germany every year for Christmas until the fireplace mantel was full.