I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is the remix of an Openclipart clipart called "Maze" uploaded by "any_ono_mous".Thanks.This is a seamless pattern of a maze.
Source Yamachem
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Subtle scratches on a light gray background.
Source Andrey Ovcharov
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
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Colour version of the original pattern.
Source Firkin
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Seamless Dark Grunge Texture. Here's a new grunge texture for use as a background.
Source V. Hartikainen
Prismatic Snowflakes Pattern No Background
Source GDJ
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen