A set of paper filters. The base texture is generated the same way, only the compositing mode is varied.
Source Lazur URH
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
Lovely pattern with splattered vintage speckles.
Source David Pomfret
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem