A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
A free background pattern with abstract green tiles.
Source V. Hartikainen
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
Prismatic Geometric Pattern Background No Black
Source GDJ
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
Might not be super subtle, but quite original in its form.
Source Alex Smith
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
This background texture resembles stone. It may be used as a background on web pages or on some of their html elements (header, borders, menu bar, etc.). Just modify it for your needs.
Source V. Hartikainen