Prismatic Hypnotic Pattern No Background
Source GDJ
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
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 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
If you need stars, this is the one to get.
Source Agus Riyadi
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
This is a remix of "geometrical pattern 01".
Source Yamachem
Colour version of the original pattern.
Source Firkin
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Prismatic Groovy Concentric Background 2
Source GDJ
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin