Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin