The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Sharp pixel pattern, just like the good old days.
Source Paridhi
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Prismatic Polka Dots Mark II No Background
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
A seamless texture of worn out "cardboard".
Source V. Hartikainen
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem