The Blow Bottle
 
The instrument I made is named "The Blow Bottle."  The materials I made it out of are a straw, a glove, construction paper, a Gatorade bottle, and rubber bands.

It works by blowing into the straw and the vibrations hit the glove that the rubber bands are holding to the end of the bottle.  That causes the vibrations to bounce off the glove and pass through the construction paper to make the sound.

To change the pitch you haft to tighten the glove.  My instrument is part of the woodwind family.