Have you ever heard of a Scene Setter? They are great products for decorating walls for a party without breaking the bank. I love to use them as they cover a big space in no time and look great!
The Scene Setters come in different sizes: background rolls, door size, borders and window size. These posters are printed in color over transparent plastic and are sturdy enough to last for years. Several themes are available such as Hollywood, Fiesta, Cowboy, Disco, Princess, Spongebob, Sesame Street, Hawaiian and of course Halloween!
Available at your party supply store and here in the Netherlands search for them online!