Hey there!
First off I'd like to say that I love PSS and it's my daily driver for painting and drawing. In the latest version, you guys have added changing the background color, which is an awesome feature! I think that if you make it possible to add a paper texture to it, it would make it even better.
For some reason when I'm sketching or drawing, I like to do it over a paper textured background, so personally I'd find it great if you guys were to add that as a feature.
Adding paper texture to background.
Re: Adding paper texture to background.
we plan to add this function in one of the nearest updates