I was using Wunderlist, and I was wonderling what the texture is that is used in the sidebar, as shown in this image:
It looks like some sort of fabric, but I'm not quite sure.
It does look like Linen or other kind of woven pattern. You can find a lot of such subtle (and free) patterns here: http://subtlepatterns.com/
Looks to be a basic Linen-like texture to me. Used to mimic the texture of linen stock. Could possible be a Laid texture though. It's a bit hard to tell due to the angle.
I'm not sure, but I bet if you add some noise to a layer in photoshop, then applied the motion blur horizontally, you'd be able to create it.