1 Design striped invitations on a computer using Adobe Photoshop software, then print them on card stock. 2 Offer guests temporary flag tattoos from Body Graphics ($1 each; 866-TMP-TATS). 3 Use a flag-patterned ribbon as a napkin ring ($2 a yard from So Good; 212-398-0236). 4 Buy a patriotic arrangement of red ranunculuses and white and blue hydrangeas (Laurels in Los Angeles is Goin's favorite florist; 323-655-3466). 5 For the centerpiece, plant paper cocktail flags in sand (80 cents for a pack of 30 from Michaels; 800-MICHAELS). 6 Give star T-shirts as a party favor—create a design on the computer and have a photo shop print it on the shirts.