Triangular #1156
Gray CC BY-SA 3.0Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
More Textures
Background pattern 314 (colour 5) #1835
Pink CC 0The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Tessellation 16 (colour 5) #2211
Yellow CC 0The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Polyskelion Pattern No Background #394
Light CC 0Prismatic Polyskelion Pattern No Background
Source GDJ
Tessellation 16 (colour 3) #2213
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
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
Weave #733
Wall CC BY-SA 3.0Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Background pattern 308 #1872
Yellow CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Bright Squares@2X #88
Light CC BY-SA 3.0It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
"Honeycomb", Orange Background Pattern #1313
Orange CC BY-SA 3.0The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
Dark Fish Skin@2X #1049
Dark CC BY-SA 3.0It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
White Wall 2@2X #1021
Wall CC BY-SA 3.0A new one called white wall, not by me this time.
Source Yuji Honzawa
Background pattern 207 #2466
Yellow CC 0A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Decorative divider #1962
Dark CC 0From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
Rocky Wall@2X #42
Light CC BY-SA 3.0High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Concrete Wall #77
Wall CC BY-SA 3.0Dark blue concrete wall with some small dust spots.
Source Atle Mo
Grilled Noise #581
Fabric CC BY-SA 3.0You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Floral design 99 (colour) #1777
Green CC 0From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Txture #757
Dark CC BY-SA 3.0Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Dark Wall #817
Dark CC BY-SA 3.0Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Background pattern 201 (colour) #2497
Grid CC 0A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Leafy frame 31 #1726
Green CC 0A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
Warped Stripes on Paper #1073
Paper CC BY-SA 3.0A seamless background of warped stripes on paper.
Source V. Hartikainen