Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
"Beige Stone", Tileable Texture.
Source V. Hartikainen
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
This one has rusty dark brown texture.
Source V. Hartikainen
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Psychedelic Geometric Background No Black
Source GDJ
Prismatic Polka Dots Mark II No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Retro Circles Background 7 No Black
Source GDJ
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick