Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Prismatic Groovy Concentric Background 3
Source GDJ
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Neat little photography icon pattern.
Source Hossam Elbialy
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
This is sort of fresh, but still feels a bit old school.
Source Martuchox
Embossed lines and squares with subtle highlights.
Source Alex Parker
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ