Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A seamless texture of worn out "cardboard".
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
Same classic 45-degree pattern, dark version.
Source Luke McDonald
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A simple bump filter made upon request at irc #inkscape at freenode. Made a screen capture of the making here: https://youtu.be/TGAWYKVLxQw
Source Lazur URH
Prismatic Triangular Background Design Mark II 5
Source GDJ
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
You may use it as is, or modify it as you like.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
Prismatic Basic Pattern 2 No Background
Source GDJ
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Prismatic Hypnotic Pattern 2 No Background
Source GDJ