You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background 5
Source GDJ
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Abstract Tiled Background Extended 10
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Original minus the background
Source Firkin
Here's a new gray "fabric" pattern. Use it as backgrounds for websites or for other purposes.
Source V. Hartikainen
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Might not be super subtle, but quite original in its form.
Source Alex Smith
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Just the symbols of the signs of the zodiac distributed in a chequer board-like pattern
Source Firkin