Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
From a drawing in 'From Snowdon to the Sea. Striking stories of North and South Wales', Marie Trevelyan, 1895.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ