If so, you might want to try beating the Guinness World Record for "largest aluminium can sculpture." This record was set in early September by three groups from Takatori-cho, Nara Prefecture. They created a replica of Takatori Castle with 35,679 empty cans donated by 380 households as well as by local companies.
For a video news report, look HERE.
Of course, the record is for the "largest" sculpture, so perhaps you can do it with fewer cans.