Doris Salcedo, Installation at International Istanbul Biennial, Salcedo's idea was to create a "topography of war"--not tied to a specific historical event, but to war in general. wooden chairs piled high between two buildings in central Istanbul.
Turn old newspaper into seedling pots. They can be planted directly into the ground as the paper will eventually biodegrade. You can form them by wrapping the paper around a jam jar or similar, or there are 'devices' that can be bought to make the pots.