I "am not sure what specific job, but family. Com always has a large craft w / the simplest materials. You can also search for Girl Scout crafts using bottle caps.
Get your aluminum cans and cut the top with a pair of shears, then cut strips around the can and twist them up and make little furniture, chairs, tables. I sold the ones I made at a garage sale they are all sold.
You need a pair of needle nose pliers to twist the blades.
Why u dont Google "craft bottle cap" and a list of many Web sites appear for bottle cap crafts