From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
A brown metallic grid pattern layered on top of a dark fabric texture. It should look great when using as a tiled background on web pages, especially blogs.
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
This background pattern has futuristic look. So, maybe it could be used on websites or blogs dedicated to video games?!
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin