In the past few years, we have covered plenty of ferrofluid toys here. The Ferrofluid Desk Clock is also worth a look. It has hour and minute hands made with magnetic liquid that are held in place with magnets. It comes with 5 different clock faces for you to choose from. You can also interact with the clock using magnets.
This clock comes with a hand crushed aluminum face. It runs for a year on a single AA battery.