A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
Prismatic Geometric Pattern Background
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Number five from the same submitter, makes my job easy.
Source Dima Shiper