A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
You guessed it – looks a bit like cloth.
Source Peax Webdesign
A black tile-able background with paper-like texture.
Source V. Hartikainen
Sharp but soft triangles in light shades of gray.
Source Pixeden
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Gold Triangular Seamless Pattern No Background
Source GDJ
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Prismatic Geometric Pattern Background 2
Source GDJ
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Prismatic Groovy Concentric Background 3
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett