The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
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 beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Retro Circles Background 8 No Black
Source GDJ
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. A version of the original with random colors.
Source Firkin
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Geometric Tessellation Pattern No Background
Source GDJ