From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Number five from the same submitter, makes my job easy.
Source Dima Shiper
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Original seamless pattern with an Inkscape filter.
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
Sometimes you just need the simplest thing.
Source Fabricio
This was formed by distorting an image of a background on Pixabay.
Source Firkin
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
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens