Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Sharp pixel pattern, just like the good old days.
Source Paridhi
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Element of beach pattern with background.
Source Rones
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Gold Triangular Seamless Pattern No Background
Source GDJ
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Background formed from the original with an emboss effect
Source GDJ
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko