Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Prismatic Hypnotic Pattern No Background
Source GDJ
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
A seamless pattern formed from a square tile based on a jpg on Pixabay. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The image is the remix of "wire-mesh fence seamless pattern" .This is a more minute version of it.Sorry for the file size.Using path>difference in Inkscape, I will cut out any silhouette from this pattern and create a "meshed silhouette".
Source Yamachem
This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.
Source V. Hartikainen
Prismatic Abstract Line Art Pattern Background
Source GDJ
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen