Making a theremin is always fun, apart from the variety of sounds you can generate the possibility of giving it to someone else as a gift is always great and an interesting way to encourage them to learn more about making things. With this spirit in mind, check out the version created by Instructables user "faziefazie" who has presented a fun mixture of sound and light with their theremin project. Furthermore it has been constructed as a finished product, which makes it portable and transferable, for example:
If you're interested in working with sound piezos for various reasons we have a neat little SOUND: sound and buzzer module:
It can be used as a noise-maker driven by your microcontroller for audible feedback of events, and it can also be used as a knock-detector input to sense events and react to them. Includes a built-in 1M resistor to allow the piezo element to detect shocks. For more information and to order, please visit the product page here.