Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
A background pattern with a look of rough fabric.
Source V. Hartikainen
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Prismatic Triangular Background Design Mark II 5
Source GDJ
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski