I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
8 by 8 pixels, and just what the title says.
Source pixilated
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/
Source Yamachem
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
A seamless background of warped stripes on paper.
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden
This is a remix of "geometrical pattern 01".
Source Yamachem
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin