Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
A seamless background of warped stripes on paper.
Source V. Hartikainen
Abstract Tiled Background Extended 6
Source GDJ
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Abstract Ellipses Background Grayscale
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
A heavy hitter at 400x400px, but lovely still.
Source Breezi
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo