The image depicts a seamless pattern made using a bird's face.
Source Yamachem
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
A black tile-able background with paper-like texture.
Source V. Hartikainen
The name is totally random, but hey, it sounds good.
Source Atle Mo
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
The original enhanced with one of Inkscapes's filters.
Source Firkin
A new one called white wall, not by me this time.
Source Yuji Honzawa
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Oh yes, it happened! A pattern in full color.
Source Atle Mo
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem