Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Prismatic Groovy Concentric Background No Black
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
A comeback for you: the popular Escheresque, now in black.
Source Patten
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Alternative colour scheme for the original floral pattern.
Source Firkin
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Looks like an old rug or a computer chip.
Source Patutin Sergey
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel