You may use it as is, or modify it as you like.
Source V. Hartikainen
Prismatic Geometric Pattern Background
Source GDJ
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
ZeroCC tileable beechwood wood texture, generated in Neo Texture Edit by me. CC0
Source Sojan Janso
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Almost like little fish shells, or dragon skin.
Source Graphiste
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
A new one called white wall, not by me this time.
Source Yuji Honzawa
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim