The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
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
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Retro Circles Background 7 No Black
Source GDJ
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
Sometimes you just need the simplest thing.
Source Fabricio
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso