festoon
To decorate by hanging loops of flowers, ribbons, or lights.
Festoon means to decorate something by draping chains of flowers, ribbons, paper, or fabric in graceful loops and curves. When you festoon a room for a party, you might hang colorful streamers from corner to corner, letting them dip and sway in elegant arcs. A ballroom festooned with garlands looks dressed up and celebratory, like it's wearing fancy jewelry.
Today you might see school hallways festooned with paper chains during the holidays, or a wedding tent festooned with strings of lights and flowing fabric.
As a noun, a festoon is one of those decorative loops itself. The three festoons of bunting hanging across the stage give it a patriotic look. The word suggests something cheerful and abundant rather than minimal or plain. When something is festooned with decorations, they're draped generously, creating a sense of festivity and joy. It's the difference between taping one banner to a wall and draping swirling garlands throughout an entire room.