To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
A comeback for you: the popular Escheresque, now in black.
Source Patten
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning