Fix and cc0 to get the tile this is based on.
Source SliverKnight
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A cute x, if you need that sort of thing.
Source Juan Scrocchi
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
A pale olive green background with a seamless texture.
Source V. Hartikainen
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba