A heavy hitter at 400x400px, but lovely still.
Source Breezi
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
A bit of scratched up grayness. Always good.
Source Dmitry
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Colour version of the original seamless pattern.
Source Firkin
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
From a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Zero CC tileable ground cracked, crackled, texture, made by me.
Source Sojan Janso
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
This is a hot one. Small, sharp and unique.
Source GraphicsWall
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
The starting point for this was drawn on the web site steamcoded.org/PolyskelionMaker.svg
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Oh yes, it happened! A pattern in full color.
Source Atle Mo
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Hypnotic Pattern No Background
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin