https://www.etsy.com/sg-en/listing/122557513/personalized-your-voice-sound-wave-print?ref=shop_home_active_5

This is one of the coolest and strangest gifts I have ever seen. You record your voice and have it printed out to give to someone. I think this would make a great gift for singers, musicians, or maybe even the hearing impaired, so that they can see the sounds.