Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Prismatic Chevrons Pattern 5 With Background
Source GDJ
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous