Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A simple bump filter made upon request at irc #inkscape at freenode. Made a screen capture of the making here: https://youtu.be/TGAWYKVLxQw
Source Lazur URH
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Tiny circle waves, almost like the ocean.
Source Sagive
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin