Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
A bit strange this one, but nice at the same time.
Source Diogo Silva
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
An alternative colour scheme for the original background.
Source Firkin
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
A seamless background of warped stripes on paper.
Source V. Hartikainen
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
A free seamless background pattern for use on websites.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin