The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A brown metallic grid pattern layered on top of a dark fabric texture. It should look great when using as a tiled background on web pages, especially blogs.
Source V. Hartikainen
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A free seamless background with pink spots.
Source V. Hartikainen
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso