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
White circles connecting on a light gray background.
Source Mark Collins
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Prismatic Groovy Concentric Background No Black
Source GDJ
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Run a restaurant blog? Here you go. Done.
Source Andrijana Jarnjak
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo