There is no occasion that is ill-suited for a garland. They can convey a color, design, theme, or, in the case of these lovely examples, a message.
Off the beaten path phrases from Banter Banners.
Christmas carol banners from Katie Did.
A simple birthday garland made from circles cut from cereal boxes, baker's twine, and letter stickers (no glue needed…just use the sticker to attach string to cardboard). From Parents Magazine.
How Sweet It Is, for real, from Simple Song.