A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Seamless Green Tile Background
Source V. Hartikainen
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
A comeback for you: the popular Escheresque, now in black.
Source Patten
A bit of scratched up grayness. Always good.
Source Dmitry
Abstract Tiled Background Extended 6
Source GDJ
The classic notebook paper with horizontal stripes.
Source Are Sundnes
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
This was formed by distorting an image of a background on Pixabay.
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green