This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
Black brick wall pattern. Brick your site up!
Source Alex Parker
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
Different from the original in being a simple tile stored as a pattern definition, rather than numerous repeated objects. Hence easy and quick to give this pattern to objects of different shapes. To get the tile in Inkscape, select the rectangle and use shift+alt+i.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
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
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
A bit strange this one, but nice at the same time.
Source Diogo Silva
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim