Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
Retro Circles Background 4 No Black
Source GDJ
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
I’m not going to lie – if you submit something with the words Norwegian and Rose in it, it’s likely I’ll publish it.
Source Fredrik Scheide
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Continuing the geometric trend, here is one more.
Source Mike Warner
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective