A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
Sort of reminds me of those old house wallpapers.
Source Tish
More in the paper realm, this time with fibers.
Source Jorge Fuentes
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Prismatic Groovy Concentric Background 2
Source GDJ
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Alternative colour scheme to the original.
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A free grid paper background pattern for using on web sites.
Source V. Hartikainen