A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless canvas texture for using as background on websites. Colored in pale tones of brown.
Source V. Hartikainen
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Sometimes you just need the simplest thing.
Source Fabricio
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso