A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
The image a seamless pattern derived from a weed which I can't identify.The original weed image is from here:https://jp.pinterest.com/pin/500744052301423641/
Source Yamachem
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Colorful Floral Background No Black
Source GDJ
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
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. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin