Tileable Wood #655
Wood CC BY-SA 3.0Not so subtle. These tileable wood patterns are very useful.
Source Elemis
More Textures
Prismatic Abstract Geometric Background 5 No Black@2X #792
Noise CC 0Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Grass #1278
Green CC 0Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
Blizzard #663
Paper CC BY-SA 3.0This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Decorative divider 206 #2380
Dark CC 0Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
White carbon@2X #12
Carbon CC BY-SA 3.0Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Soft Kill@2X #319
Dark CC BY-SA 3.0Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
45-Degree Fabric #1
Fabric CC BY-SA 3.0Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Fence 3 #2578
Wood CC 0A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Decorative divider 290 #1817
Dark CC 0From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Leafy design 18 (colour)@2XaFloral design 96 (colour) #1787
Green CC 0From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Background pattern 245 (colour 5) #2188
Green CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Fabric pattern #2402
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
Colorful Floral Background 3 No Black@2X #486
Light CC 0Colorful Floral Background 3 No Black
Source GDJ