How to create the 'paper mache' texture used along with the Acrylic Accent by Microsoft?

Question

I would like to generate the 'paper mache' texture that MS is using in its own apps, like Groove and Movie.

I already know how to create the transparent background, using CreateHostBackdropBrush() etc.

I only want to know if someone have some idea on the particular texture used, maybe using some Composition effect?

Here is an example:

Any idea?

I love it!