A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
From an image on opengameart.org shared by rubberduck.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Dark blue concrete wall with some small dust spots.
Source Atle Mo