To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Embossed lines and squares with subtle highlights.
Source Alex Parker
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
8 by 8 pixels, and just what the title says.
Source pixilated
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
A nice and simple white rotated tile pattern.
Source Another One
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber