An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Background formed from the original with an emboss effect
Source GDJ
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Alternative colour scheme for the original floral pattern.
Source Firkin
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem