This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
A comeback for you: the popular Escheresque, now in black.
Source Patten
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Prismatic Geometric Pattern Background No Black
Source GDJ
Fix and cc0 to get the tile this is based on.
Source SliverKnight
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
This one has rusty dark brown texture.
Source V. Hartikainen
Colour version of the original pattern.
Source Firkin
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin