I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Looks like an old wall. I guess that’s it then?
Source Viahorizon
f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
An alternative colour scheme to the original seamless pattern.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Green Background Pattern
Source V. Hartikainen
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Element of beach pattern with background.
Source Rones
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Colourful background achieved with gradient fills.
Source Firkin