Number five from the same submitter, makes my job easy.
Source Dima Shiper
Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
U.S.-based National Fire Protection Association standard fire diamond for flagging risks posed by hazardous materials. The red diamond has a number 0-4 depending on flammability. The blue diamond has a number 0-4 depending on health hazard. The yellow has a number 0-4 depending on reactivity. the white square has a special notice, e.g OX for oxidizer.
Source Firkin
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
This one has rusty dark brown texture.
Source V. Hartikainen
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Seamless Green Tile Background
Source V. Hartikainen
Prismatic Hypnotic Pattern 2 No Background
Source GDJ