From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Prismatic Basic Pattern 2 No Background
Source GDJ
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Sharp pixel pattern, just like the good old days.
Source Paridhi
Prismatic Geometric Tessellation Pattern No Background
Source GDJ