This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Prismatic Abstract Geometric Background 4
Source GDJ
A repeating gloomy background image. This one consists of a pattern of black chains layered on top of a dark textured background.
Source V. Hartikainen
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Seamless pattern formed from a tile that can be extracted 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 pattern in Inkscape and use shift+alt+i.
Source Firkin
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Abstract Tiled Background Extended 10
Source GDJ
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Gold Triangular Seamless Pattern No Background
Source GDJ
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A bit strange this one, but nice at the same time.
Source Diogo Silva
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton