Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Prismatic Groovy Concentric Background 3
Source GDJ
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A black tile-able background with paper-like texture.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
You may use it as is, or modify it as you like.
Source V. Hartikainen
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
A seamless pattern formed from a square tile based on a jpg on Pixabay. The tile can be retrieved 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 unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra