Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Prismatic Abstract Geometric Background 5
Source GDJ
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
A seamless background of warped stripes on paper.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak