A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
This one is amazing, truly original. Go use it!
Source Viahorizon
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
Sometimes you just need the simplest thing.
Source Fabricio