Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
Inspired by the B&O Play, I had to make this pattern.
Source Atle Mo
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Prismatic Groovy Concentric Background 2
Source GDJ
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
U.S.-based National Fire Protection Association standard fire diamond for flagging risks posed by hazardous materials. The red diamond has a number 0-4 depending on flammability. The blue diamond has a number 0-4 depending on health hazard. The yellow has a number 0-4 depending on reactivity. the white square has a special notice, e.g OX for oxidizer.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
The image depicts a seamless pattern which was made using stripe-like things including borders.I used OCAL cliparts called "Blue Greek Key With Lines Border" uploaded by "GR8DAN" and "daisy border" uploaded by "johnny_automatic".Thanks.
Source Yamachem
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin