A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
Prismatic Hexagonalism Pattern No Background
Source GDJ
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
White little knobs, coming in at 10x10px. Sweet!
Source Amos
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady