suggest material

hello every1…
this is my design assignment in 3rd semester. i need to design panel for an open space. no environmets have been given to us as yet. we have to finalise the amterial first and then the environment will b given to us… i wud be grateful if any1 cud suggest me eco-friendly materials which cud be used in manufacturin panels. it might b used by hospitals for creating awarness regarding AIDS. or by some govt. department for any purpose. it has to b low cost. the size is 600 MM X 900 MM
dnt have much knowledge abt materials other than timber and plastics.plz help if possible


om sai

how about recycled dictionaries?