If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
A free seamless background pattern for use on websites.
Source V. Hartikainen
Colour version of the original pattern.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
Prismatic Floral Background No Black
Source GDJ
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Seamless Light Background Texture.
Source V. Hartikainen
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Prismatic Abstract Line Art Pattern Background 2
Source GDJ