This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.
Source Yamachem
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A seamless web texture of "green stone".
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Prismatic Floral Background No Black
Source GDJ
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
A white version of the very popular linen pattern.
Source Ant Ekşiler
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ