A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
A new one called white wall, not by me this time.
Source Yuji Honzawa
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
An alternative colour scheme to the original seamless pattern.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen