The starting point for this was drawn on the web site steamcoded.org/PolyskelionMaker.svg
Source Firkin
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Prismatic Abstract Geometric Background 3
Source GDJ
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
Wasn't satisfied with the original's colouring. Too much component transfer and colormatrixes yet the results are lacking a bit. So this time it is a simple black to transparent fade, making it possible remixing easily once there will be other blending modes supported as well. Probably in inkscape 0.92.
Source Lazur URH
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
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
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
Continuing the geometric trend, here is one more.
Source Mike Warner
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A free background pattern with abstract green tiles.
Source V. Hartikainen