To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
This is the remix of "plant pattern 02".I changed the object color to white and the BG to purple.The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:jp.pinterest.com/pin/500744052301423641/
Source Yamachem
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.