I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A new one called white wall, not by me this time.
Source Yuji Honzawa
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
A pale olive green background with a seamless texture.
Source V. Hartikainen
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida