This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Original minus the background
Source Firkin
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
You know you love wood patterns, so here’s one more.
Source Richard Tabor
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Prismatic Abstract Background Design
Source GDJ
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen
Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
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