New wallpaper backgrounds for your playpen! Place the bmps in your game's Resource\Wallpaper\ folder, then choose them in the Options > General Options... dialog box.
I've always loved this soft carpet background... These also work as textures for hexing (though some look better than others because of the texturable colors changing shade).
Artwork by Naoko Takeuchi of course, I just put it in petz colors.
Petz by P.F. Magic