Party paper is a type of thin, decorative paper used for special occasions such as birthdays, weddings, and other celebrations. It is often used to make decorations, streamers, and other decorations. The term 'party paper' can also refer to the paper plates, cups, and napkins used at parties. The crossword solution for the term 'party paper' is crepe, which is a type of thin, crinkled paper with a slightly glossy finish. Crepe paper is often used to make decorations, streamers, and other decorations for parties.