A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Prismatic Curved Diamond Pattern No Background
Source GDJ
A bit strange this one, but nice at the same time.
Source Diogo Silva
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
A repeating background with wood/straw like texture.
Source V. Hartikainen
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin