Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
From a drawing in 'Prose and Verse ', William Linton, 1836.
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
It looks very nice I think.
Source V. Hartikainen
Black brick wall pattern. Brick your site up!
Source Alex Parker
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Sharp but soft triangles in light shades of gray.
Source Pixeden
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
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Prismatic Abstract Background Design No Black
Source GDJ
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber