Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Seamless Prismatic Geometric Pattern With Background
Source GDJ
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
An attempt for cleaning up the original image in a few steps.
Source Lazur URH