"Polished Stone", Gray Background Pattern #1053
Stone CC BY-SA 3.0A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
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Green CC 0Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
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Source Olivier Pineda
Dark Fish Skin@2X #1049
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Source Petr Šulc
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Red CC 0To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Pyramid #895
Light CC BY-SA 3.0Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
White Carbon Fiber #823
Light CC BY-SA 3.0More carbon fiber for your collections. This time in white or semi-dark gray.
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Retro Intro #893
Gray CC BY-SA 3.0A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
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Dark CC 0Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
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Source Firkin
Wood Pattern@2X #371
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Source Alexey Usoltsev
Wild Flowers #1181
Gray CC BY-SA 3.0Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
Abstract Stars Geometric Pattern Prismatic No Background@2X #810
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Wide Rectangles #699
Wall CC BY-SA 3.0Simple wide squares with a small indent. Fits all.
Source Petr Šulc.