Background pattern 302 #1894
Red CC 0The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
More Textures
Fabric pattern (colour 6) #2397
Fabric CC 0Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Abstract Tiled Background Extended 11 #522
Noise CC 0Abstract Tiled Background Extended 11
Source GDJ
overlay crack #153
Noise CC 0This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Subtle Dots@2X #922
Light CC BY-SA 3.0As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Wavy background #2021
Pink CC 0CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Tessellation 16 (colour 4) #2212
Green CC 0The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Background pattern 105@2X #564
Dark CC 0A seamless pattern formed from background pattern 102
Source Firkin
Clean gray paper #859
Paper CC BY-SA 3.0On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Zig-zag pattern 6 #2413
Grid CC 0A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Axiom Pattern@2X #331
Grid CC BY-SA 3.0Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Diagmonds@2X #337
Dark CC BY-SA 3.0Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
White Wall 3@2X #1149
Wall CC BY-SA 3.0This one needs to be used in small areas; you can see it repeat.
Source Luca