Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Hypnotic Pattern No Background
Source GDJ
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Psychedelic Geometric 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
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Classic 45-degree pattern, light version.
Source Luke McDonald
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
"Beige Stone", Tileable Texture.
Source V. Hartikainen
Prismatic Abstract Geometric Background 5
Source GDJ