From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Green Web Background, Seamless tile.
Source V. Hartikainen
From a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Kaleidoscope Prismatic Abstract No Background
Source GDJ