From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
This background texture resembles stone. It may be used as a background on web pages or on some of their html elements (header, borders, menu bar, etc.). Just modify it for your needs.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective