I have finally added back the possibility to change the shoutbox background! The choice is located where it used to be, at the bottom of the shout box.

Important : The backgrounds available are different for each site, and only the site builders are able to add some. If you are a "graphics site builder", then just go into the building part to add new backgrounds! (Advice : lower the contrast on the pictures, otherwise the text won't be readable)

And...Merry christmas to everyone, and have a nice holiday!