The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Not the most subtle, but very useful.
Source Kerstkaarten
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
A comeback for you: the popular Escheresque, now in black.
Source Patten
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Sharp but soft triangles in light shades of gray.
Source Pixeden
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Prismatic Geometric Pattern Background 2
Source GDJ
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Alternative colour scheme. 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