Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
It looks very nice I think.
Source V. Hartikainen
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 5
Source GDJ
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Continuing the geometric trend, here is one more.
Source Mike Warner
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Black And White Floral Pattern Background from PDP.
Source GDJ
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Might not be super subtle, but quite original in its form.
Source Alex Smith
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo