Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Prismatic Groovy Concentric Background 3
Source GDJ
Prismatic Polyskelion Pattern No Background
Source GDJ
Abstract Ellipses Background Grayscale
Source GDJ
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
An alternative colour scheme to the original seamless pattern.
Source Firkin
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra