A seamless texture of a rough concrete surface.
Source V. Hartikainen
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A version without colours blended together to give a different look.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Classic vertical lines, in all its subtlety.
Source Cody L
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok