0 Steam profile backgrounds where blue is the main colour, ranked by community votes. The colour is measured from each picture's pixels, so every background here really is mostly blue. Open any of them for a full-size preview, the game it comes from, its price and similar backgrounds, or narrow the list down by style below.
No backgrounds here yet. They appear automatically once the pictures have been analysed.
Every background is downscaled and each pixel is put into one of ten colour groups. A background is listed under a colour when that colour covers a large part of the picture, so the lists reflect what you actually see, not the game's name.
Buy it on the Steam Community Market or in the Points Shop. Then open your profile, click Edit Profile → Profile Background, pick it and save.
New backgrounds are analysed automatically a few times a day; a background appears in the colour lists once its picture has been checked.