I tried several different things on a small scale before committing to my large design wall.
I went with black fleece!
Several years later ... I have no regrets.
Wait, there is one ... that it was not larger!!
However, at 7-1/2ftx10ft (full size of wall), I shall not complain!!!
And now I wonder how I ever managed without it.
So ... whatever you decide go with the largest size you can!