Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
Old China with a modern twist, take two.
Source Adam Charlts
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Oh yes, it happened! A pattern in full color.
Source Atle Mo
Otis Ray Redding was an American soul singer-songwriter, record producer, arranger, and talent scout. So you know.
Source Thomas Myrman
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
Might not be super subtle, but quite original in its form.
Source Alex Smith
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
A bit strange this one, but nice at the same time.
Source Diogo Silva