Make simple invitations shaped like jewelry gift boxes from Tiffany Blue or black cardstock. Tie white ribbons around them to complete the effect. Tiffany Blue is an aqua-tinged blue used for the store's boxes and bags. Another option is to create a white-on-black Holly Golightly silhouette on the front of the invitation. Suggest women guests wear little black dresses; hand out imitation tiaras from a party store. Have men guests wear suits and ties to keep the mood ritzy.
Find tablecloths in Tiffany Blue and white, or choose a classic black-and-white theme for a more formal look. If you use a Tiffany Blue cloth, run a large white ribbon down the middle of the table as a runner; cross the table again with the ribbon for a Tiffany's gift box effect. Hang the walls with "Breakfast at Tiffany's" movie posters. Several versions are available from poster shops and from online sellers. Mix in photos of Audrey Hepburn as Holly Golightly, including her classic pose in a little black dress and tiara.
Decorate the tables with Tiffany Blue jelly beans, fake diamond rings and necklaces, pearl chokers and sleeping masks with fake eyelashes glued to the front. Imitation jewelry is available at novelty and party stores, and discount stores often sell sleeping masks you can decorate with false eyelashes. Include touches of silver with vases and martini shakers; shop for silvered plastic imitations if you prefer.
Serve martinis to the guests; offer virgin martinis for those who don't drink. Don't forget the olives. Serve finger foods on trays. Add atmosphere to your party by playing the "Breakfast at Tiffany's" soundtrack. "Moon River" is a must.
Present a movie-related trivia game, or lead guests in musical chairs to the movie soundtrack. Give out such prizes as "Breakfast at Tiffany's" DVDs or copies of Truman Capote's original story.