It make me feel bad when I see because It didn't match my room decoration. Sorry if some parts of the sentences look strange. I use to translate
You can just put any wallpaper over it. One random wallpaper is available every day from Pierre's for 100g. Or you can buy a catalogue from Pierre for 30,000g, which will give you every wallpaper and flooring for free.
...oh, wait, I completely misunderstood your problem because I didn't know what Penny's 14-heart scene was. Sorry.