A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Groovy Concentric Background 4
Source GDJ
Alternative colour scheme for the original floral pattern.
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Gold Triangular Seamless Pattern No Background
Source GDJ
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo