An aged paper background tile with smeared and pressed text.
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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The original enhanced with one of Inkscapes's filters.
Source Firkin
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Prismatic Groovy Concentric Background 2
Source GDJ
A bit strange this one, but nice at the same time.
Source Diogo Silva
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Colour version of the original pattern.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
From a drawing in 'Kingsdene', Maria Fetherstonehaugh, 1878.
Source Firkin
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A version without colours blended together to give a different look.
Source Firkin