Commonly, when talking about the decoration you only think of stuffs that could be used to decorate. However, you can also create the festive decoration just by treating your walls. Here, you can apply the mural art into your wall with the proper design. It means that the design should be able to fulfil your needs in decoration. Whether with the furniture and ornament or not.
Related with winter season, then make sure that you give the winter touch into the mural. It could be the theme or the colors that could represent the winter impression. For your consideration, you can use blue or white colors. Then, in case winter will be known as the Christmas season, you could apply Christmas colors too. The following picture references will show you more on some awesome mural designs you can have.