Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
This is a seamless pattern of a woody texture.The original image is here:https://pixabay.com/ja/users/ClassicallyPrinted-1302233/
Source Yamachem
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Prismatic Basic Pattern 2 No Background
Source GDJ
Prismatic Abstract Background Design
Source GDJ
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin