Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Prismatic Polyskelion Pattern No Background
Source GDJ
A tile-able background for websites with paper-like texture and a grid pattern layered on top of it.
Source V. Hartikainen
Prismatic Basic Pattern 2 No Background
Source GDJ
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Alternative colour scheme. 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
Background formed from the original with an emboss effect
Source GDJ
Almost like little fish shells, or dragon skin.
Source Graphiste
Prismatic Abstract Geometric Background 5
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin