The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Looks like an old wall. I guess that’s it then?
Source Viahorizon
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel