The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Retro Circles Background 7 No Black
Source GDJ
Prismatic Groovy Concentric Background
Source GDJ
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Looks like an old wall. I guess that’s it then?
Source Viahorizon
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
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
Sometimes you just need the simplest thing.
Source Fabricio
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Prismatic Geometric Pattern Background 2 No Black
Source GDJ