After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
8 by 8 pixels, and just what the title says.
Source pixilated
Abstract Tiled Background Extended 12
Source GDJ
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
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
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
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