Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
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
Zero CC plastic pattern texture, photographed and made by me. CC0 *Note, this texture was on the perfectly smooth surface of a plastic shovel scraper, not sure how to call it. Plz coment if you know what its called.
Source Sojan Janso
Prismatic Geometric Pattern Background No Black
Source GDJ
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
There are many carbon patterns, but this one is tiny.
Source Designova
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Prismatic Groovy Concentric Background 3
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Background pattern originally a PNG drawn in Paint.net
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin