Ginger White is a great site for all sorts and today I came across
Acoustic Art Panels and thought how fantastic it is, especially for busy areas. 
Sound absorbing art panels, cleverly disguised as contemporary art pieces, can help solve sound problems.  These panels are made from a highly absorptive semi-rigid core with a special printable fabric face.  It allows sound waves to pass through the fabric instead of bouncing off it.  This reduces any sound reverberation making spaces less noisy. 
Want to know more about this then click on the link below.

http://www.gingerwhite.co.uk/html/other_acoustic_art_panels.htm