Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Embossed lines and squares with subtle highlights.
Source Alex Parker
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner