I don't know if anyone cares, but with this tool, you can get the codes for some special backgrounds for your boxes
http://www.filb.de/?site=games/nds/dp/box&l=en
http://www.filb.de/?site=games/nds/dp/box&l=en
You can have all of them. But the sentences will work just once for each wallpaper.Can you just use one or more than one?