Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Inspired by this, I came up with this pattern. Madness!
Source Atle Mo
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ