Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This is the remix of "blue wave-seigaiha".The image depicts a seamless pattern of the front upper part of Japanese five yen coin which is used currently.This design represents a rice with ripe golden ears.
Source Yamachem
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Prismatic Abstract Background Design No Black
Source GDJ
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
A nice and simple white rotated tile pattern.
Source Another One
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin