"Yarn bombing" is a relatively new form of hypermediacy. Not only is this a form of abstract art, the bright colors draw attention to the shape of the tree trunk and display. This site has an awesome Collection of street art pieces
Painting with sound, awesome! The artist Martin Klimas splattered paint in different colors over the diaphragm of a speaker. Then turning the volume up, the vibration of the speaker sent the paint aloft in patterns.