Yesterday we attempted Mexican Metal Tooling. This is a really fun and unique project. I think children older than mine will enjoy it more and could turn out more complicated and colorful designs, but mine did help create this nice little hanging for their daddy's office.
I love the look of the added beads on these other great examples of metal tooling (here at Pepper Paints via The Crafty Crow and here at Kinderart), but we thought it was a little much given the limited display space of a cubicle. Maybe another time.
See those sites for easy-to-follow tutorials for making your own metal art.
Note: We included foil circles created by tracing around a tin can and added the foil banner at the top to customize it for Father's Day. Our subject matter includes meaningful images relating to my children and their personalities or experiences with their dad.