A version without colours blended together to give a different look.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
This is a hot one. Small, sharp and unique.
Source GraphicsWall
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green