Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Black And White Floral Pattern Background Inverse
Source GDJ
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Prismatic Geometric Pattern Background No Black
Source GDJ
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
The original enhanced with one of Inkscapes's filters.
Source Firkin
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
8 by 8 pixels, and just what the title says.
Source pixilated
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso