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
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Gold Triangular Seamless Pattern No Background
Source GDJ
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Alternative colour scheme for the original floral pattern.
Source Firkin
Prismatic Hexagonalism Pattern No Background
Source GDJ
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
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Prismatic Snowflakes Pattern No Background
Source GDJ
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen