A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
More in the paper realm, this time with fibers.
Source Jorge Fuentes
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
This is the remix of an OCAL clipart called "Art Nouveau ornament" uploaded by "microcosme".Thanks.This is a seamless pattern of an Art Nouveau ornament.
Source Yamachem
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock