Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Prismatic Floral Background No Black
Source GDJ
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Remixed from an image that was uploaded to Pixabay by CatherineClennan
Source Firkin
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
This is a remix of "geometrical pattern 01".
Source Yamachem
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Psychedelic Geometric Background No Black
Source GDJ
Looks like an old wall. I guess that’s it then?
Source Viahorizon
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen