Take out your old magazines (or the catalogs you got in the mail today. Pick a color or two (or don't). Cut out triangles of said color(s). Attach to string (or the yarn your foster dog unraveled and dragged all over the house). Hang on mantle, over doorway, or across bookcases. Instant party.
P.S. This is from the non-book by Keri Smith, who, by the way, has a new book out too, beautifully titled Mess.