Diamond pattern (colour 4) #2282
Blue CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
More Textures
Wavy tile #2024
Colorful CC 0Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Fabric of Squares #1095
Light CC BY-SA 3.0As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Background pattern 3 #222
Noise CC 0A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
White Sand #19
Light CC BY-SA 3.0Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Leafy pattern 7 #1828
Dark CC 0Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
Booze pattern #1727
Noise CC 0The tile this is based on was adapted from an image that was uploaded to Pixabay by frolicsomepl. It can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Prismatic Floral Background No Black #475
Light CC 0Prismatic Floral Background No Black
Source GDJ
Escheresque@2X #778
Light CC BY-SA 3.0Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Graphy@2X #351
Grid CC BY-SA 3.0Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Concrete Wall 2@2X #80
Wall CC BY-SA 3.0A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Groovepaper #577
Paper CC BY-SA 3.0With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
"Seamless Bark", Website Background. #879
Wood CC BY-SA 3.0This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Seamless Pink Background Texture #1233
Pink CC BY-SA 3.0A seamlessly tileable pink background texture.
Source V. Hartikainen
Background pattern 234 #2259
Brown CC 0Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Fence 7 #2576
Wood CC 0A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Diminishing design 5 #1725
Blue CC 0Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
Prismatic Triangular Seamless Pattern III With Background #273
Dark CC 0Prismatic Triangular Seamless Pattern III With Background
Source GDJ
Retro Circles Background 5 No Black@2X #427
Noise CC 0Retro Circles Background 5 No Black
Source GDJ
Seed #1289
Wall CC 0Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Abstract Tiled Background Extended 10 #521
Noise CC 0Abstract Tiled Background Extended 10
Source GDJ