i've seen people (with artistic ability) paint things on them and hang them up or sell them. otherwise you could scrap it and get maybe $5.
Death ray, sundial, idol to worship, frying pan, skillet, wok, siren amplifier, spotlight diffuser, party bowl(chips and salsa,etc), sled, extraterrestrial radio phone, convert to powerful radio telescope, solar collector(mount solar cells), polish it and add chrome finish for a truck mirror, mount a sensitive mic for a parabolic mic, the list gos on.