Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Prismatic Floral Background No Black
Source GDJ
A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Abstract Tiled Background Extended 10
Source GDJ
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin