I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
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
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
An alternative colour scheme to the original seamless pattern.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin