A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Retro Circles Background 5 No Black
Source GDJ
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
This one has rusty dark brown texture.
Source V. Hartikainen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Zero CC tileable Crackled Cement (streaks) texture, photographed and made by me. CC0
Source Sojan Janso
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Prismatic Abstract Geometric Background 2 No Black
Source GDJ