Black Wall #1240
Wall CC 0Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
More Textures
Redox 02@2X #852
Light CC BY-SA 3.0After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Wavy background #2015
Green CC 0A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Dirty Old Black Shirt #853
Dark CC BY-SA 3.0Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Seamless Gray Stone Background #1028
Stone CC BY-SA 3.0This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
Background pattern 246 (colour 2) #2185
Green CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Ground Cracked 2 #1280
Wall CC 0Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso
Stamped Dots On Metal #1083
Metal CC BY-SA 3.0A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Light Paper Fibers@2X #836
Paper CC BY-SA 3.0More in the paper realm, this time with fibers.
Source Jorge Fuentes
Black Mamba #57
Dark CC BY-SA 3.0The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Background pattern 6 #225
Noise CC 0Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Inspiration Geometry #1175
Unknow CC BY-SA 3.0This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Batthern #324
Grid CC BY-SA 3.0Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Prismatic Abstract Geometric Background 4 No Black@2X@2X #444
Dark CC 0Prismatic Abstract Geometric Background 4
Source GDJ
Pine Bark #1276
Wall CC 0Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
Polonez Pattern@2X #335
Gray CC BY-SA 3.0A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Dark Geometric@2X #620
Dark CC BY-SA 3.0Continuing the geometric trend, here is one more.
Source Mike Warner
Green Subtle Web Texture #1334
Green CC BY-SA 3.0A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Prismatic Groovy Concentric Background 3 #457
Noise CC 0Prismatic Groovy Concentric Background 3
Source GDJ
3D Wood #1475
Wood CC 0Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Simple bump #172
Dark CC 0A 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
Diamond pattern 2 (colour 2) #2267
Colorful CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin