PET Film, Not Foil
PET film is heavier than the foil normally used for party fringe, and the difference shows twice. It resists tearing while it is being unfolded and taped, which is when most curtains lose a strand, and it hangs with more body, so the fringe looks full rather than sparse. A curtain that survives one party can be folded back into its sleeve and used at the next one.
The Adhesive Strip
The adhesive comes attached along the top, which is the part that usually costs a host ten minutes and a roll of tape. Peel the backing, press the strip to a doorframe, a wall, a window edge or the bar of a photo booth stand, and the job is done standing on the floor. One person can hang it while another sets out food.
Color Behind The Guests
Rainbow is the palette that photographs well without matching anything in particular. Guests standing against it come out on a background that reads as a party rather than a living room wall, and the strands move enough to catch a flash. Balloons at the base, a string of lights above and a few props in hand are the usual additions; the fringe supplies the color behind all of it.
Easter, Then Everything Else
Easter is one weekend of the year and this hangs for the rest of them too. The same curtain has gone up for birthdays, baby showers, bridal parties, weddings, graduations, anniversaries and the end of December, since nothing on it names an occasion. Households that host often keep it in a closet as the default backdrop and pull it out whenever a camera is involved.