See http://www.etsy.com/ view_listing.php?lis ting_id=6540578
The SwoofTronic Pi is a small handheld device that allows you to change the frequency and duration of a basic sound wave using light sensors.
See http://www.etsy.com/ view_listing.php?lis ting_id=8877309
The MoofTronic is a miniature synthesiser.
It uses a stylus to play 8 different notes(one octave in the key of C). It also has a small antenna that when touched, controls the modulation span of the note being played.
http://www.etsy.com/ view_listing.php?lis ting_id=7669998
The YuleTronic plays 3 different Christmas carols, Jingle Bells, Silent Night and Rudolph, the red-nosed reindeer.