Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo