It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
This is sort of fresh, but still feels a bit old school.
Source Martuchox
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
White circles connecting on a light gray background.
Source Mark Collins
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
Retro Circles Background 4 No Black
Source GDJ
Abstract Tiled Background Extended 8
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen