Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
Prismatic Polka Dots 3 No Background
Source GDJ
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Prismatic Abstract Background Design No Black
Source GDJ
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
The image is a design of blue glass.How about using it as background image?
Source Yamachem