The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Geometric lines are always hot, and this pattern is no exception.
Not the most subtle, but very useful.
CC0 textures, backgrounds.
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Prismatic Hypnotic Pattern 2 No Background
A comeback for you: the popular Escheresque, now in black.
Prismatic Isometric Cube Extra Pattern No Background
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.
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Misc. CC0 License.
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
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
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.
Prismatic Abstract Geometric Background 5 No Black
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Paper-Wallpaper. CC0 License.
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Dark pattern with some nice diagonal stitched lines crossing over.
Prismatic Geometric Pattern Background 2
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
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.
Bark style CC0 texture.
Gamedev - Floors Textures. CC0 License.
Source Davit Masia