I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
A bit strange this one, but nice at the same time.
Source Diogo Silva
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-brown.
Source Yamachem
Number five from the same submitter, makes my job easy.
Source Dima Shiper
There are many carbon patterns, but this one is tiny.
Source Designova
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Embossed lines and squares with subtle highlights.
Source Alex Parker
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Alternative colour scheme for the original floral pattern.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso