To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Black And White Floral Pattern Background from PDP.
Source GDJ
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo