I’ve dreamed about getting this pencil wall and arrange it as a long gradient strip along a long white wall I have. But it’s so complicated to get your hands on the whole thing - buy from japan only a few pencils each month… so I thought I just make my own, but haven’t found where one can purchase a 500-pencil set. So to answer you question - I still have nothing on my walls 
Thought recently I’ve purchase some LinePosters (LinePosters - Etsy ) and a bunch of old maps that I might put up.