I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
An alternative colour scheme for the original background.
Source Firkin
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Sometimes you just need the simplest thing.
Source Fabricio
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso