'Unusual instruments'

The above video shows an animation of a 'self playing instrument' which uses arms to pluck the strings of a sort of table guitar(?).
Whilst the concept of a self playing instrument isn't not with the invention of a self playing piano (player piano) coming in the late 19th century the way in which this instrument has been conceptualised is (to the best of my knowledge) a new concept. 

While this instrument would have no real use within a music therapy setting, the concept of have a range of instruments mounted within a single piece of 'furniture' does appeal and holds many possibilites.

This video shows another form of improvised instrument, using the reed section from a trumpet and inserting the reed assembly and mouth piece into a length of vinyl tube to create a trumpet like sound.
Whilst I personally doubt the reliability of this video the idea of using pipes etc in this way is quite a nice idea and provides cheap alternatives to the brass equivelant.

See this article for further information on the way in which a trumpet mouthpiece works. 

This third video, shows the way a wind based instrument can be made out of almost anything (an egg in this case) and also shows that it is relatively easy to tune these instruments simply by englarging the holes which are made to provide the notes.
The man who creates these videos has a series of them created from a whole host of random and unusual objects, such as a burdock stick and a watermelon.