To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A classic dark tile for a bit of vintage darkness.
Source Listvetra
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
Geometric triangles seem to be quite hot these days.
Source Pixeden
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo