Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
The tile for this is based on a repeating unit close to a design on Pixabay. It can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Prismatic Snowflakes Pattern No Background
Source GDJ
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
Prismatic Triangular Background Design Mark II 5
Source GDJ
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.
Source V. Hartikainen
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
A cute x, if you need that sort of thing.
Source Juan Scrocchi
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin