I have been plagued by this blank wall in our house. It's a horrible thing to have a room just the way you want it except for one problem wall. I knew I had to fix it, but I had nothing to hang there, nor did I want to spend any money to find a solution.
I then remembered that I had four unpainted canvas that I could put to use. I chose one of the larger ones to fill the space and got out the paint and brushes! Here is the finished product.