Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Embossed lines and squares with subtle highlights.
Source Alex Parker
Alternative colour scheme for the original floral pattern.
Source Firkin
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
A version without colours blended together to give a different look.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using 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
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim