Fallal is an old fashioned word for costume jewelry or cheap, flashy trimmings on clothing. You might use Halloween as an excuse to dress up in all kinds of crazy fallal.
The noun fallal is considered obsolete, or so old fashioned that most people don't know what it means, but it's a perfectly good way to talk about showy bangles or tawdry trinkets. You can also call them fallalery, a slightly more modern, nineteenth century word. The origin of both words is thought to be the French falbala, "trimming or flounce."