As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Derived from a drawing in 'Elfrica. An historical romance of the twelfth century', Charlotte Boger, 1885
Source Firkin
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin