I have developed a small obsession with fabric buntings lately. You may also know them as a fabric banner. They are really inexpensive, so simple to make, and seem to add just the right touch to any party or special occasion.
Paper airplane garland made from old book pages, like the store in Portland a couple years ago. They had a complete wall covered in airplanes made from paper airplanes folded out of old book pages (great classroom decorating idea)