natural gilded cork accent wall
Cork decorative acoustical panels ONDA by Daniel Michalik Furniture Design
DIY corkboard wall - for the office (smaller scale) via: Young House Love http://www.younghouselove.com
Cork wall tiles
Easy DIY custom wall art. Foam insulation board wrapped in fabric. Cheap large scale wall art - would be good in a media room to soften sound.
Cool decorating idea for Persian rugs past their prime: cut & stretch over frames & hang as wall art.
Step 5 of how to sew a soundproof curtain: sew the lattice design in place.
BuzziSpace has developed the BuzziLoose in sound-insulating felt: stick it to the ceiling to dampen sounds without losing out on chic design.