Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Almost like little fish shells, or dragon skin.
Source Graphiste
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
A free background pattern with abstract green tiles.
Source V. Hartikainen
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A dark striped seamless pattern suitable for use as a background on websites.
Source V. Hartikainen
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin