Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
A tile-able background for websites with paper-like texture and a grid pattern layered on top of it.
Source V. Hartikainen
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
A seamless web texture of "green stone".
Source V. Hartikainen
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin