Psychedelic Geometric Background No Black
Source GDJ
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin