This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Embossed lines and squares with subtle highlights.
Source Alex Parker
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
The image depicts a pattern of regular hexagon.As I made to use it for myself,I want to others to use it.Speaking about the ratio of the image, height : width = 2 : √3(1.732...)Ridiculous to say,I realized later that this image is not honey comb pattern.I have to slide the second row.
Source Yamachem
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A black tile-able background with paper-like texture.
Source V. Hartikainen
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin