This isn't really a new wallpaper. I did it some time ago. My intention was to use these rare dark clothes for a non-traditional wallpaper - for DiGi Charat, at least. The spruce tree is used to balance the scene with Dejiko in the front. As you may remember, the scan of Dejiko here contained many stars over her dress, I had to shop these away. Rabi's scan was of poor JPEG quality (people, scans are not only intended for web use on Russian CRTs), so I did a lot of cleaning. Puchiko and Hokkemirin were alright, their scan is from here, if I remember correctly.
Dejiko's hair is recolored to fix CMYK saturation intent used in the artbook making. Rabi's gloves were translucent; this was taken into consideration during extraction. It is not too apparent from the resulting work though.
The wallpaper is made in 2048×1536 (4:3) to retain as much detail as possible. It still looks well when printed on an A3 paper.