The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Looks like an old wall. I guess that’s it then?
Source Viahorizon
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
Original seamless pattern with an Inkscape filter.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The original enhanced with one of Inkscapes's filters.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Prismatic Abstract Background Design No Black
Source GDJ