Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
This light background pattern has a texture of "frozen" surface with diagonal stripes. Here's an yet another addition to the collection of free website backgrounds.
Source V. Hartikainen
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
This is a remix of "geometrical pattern 01".
Source Yamachem
Prismatic Geometric Pattern Background
Source GDJ
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin