The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Prismatic Polyskelion Pattern No Background
Source GDJ
A bit strange this one, but nice at the same time.
Source Diogo Silva
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin