Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
Background pattern originally a PNG drawn in Paint.net
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin