Based on the Tibetan prayer flag tradition. The flags are small (like 5 by 8), easily made in less than an hour (altho some people will invest more time and effort in theirs). The flags may be hung indoors, but they are intended to be strung up outside where the wind will disperse their messages. After some time the prayer flags will fade and fray (they purposely are not hemmed) symbolizing the natural passing of all things. When that happens, the flags are to be burned to release the last of their prayers and then replaced by new flags that contain our renewed wishes.
(best I could do with no sewing machine…….)