You already know that there's no such thing as a bad excuse for developing a casual game. Among countless others, we find none other than Rusty Blower 3D, a game that lets you remove the rust from hundreds of objects.
Remove rust with a blowtorch
The technique used here is called rust blasting. All you need to do is simply swipe over the object to eliminate rust and, lo and behold, discover the true colors that lie beneath. As you advance through the levels, you'll discover new collections that need to be completed, such as kitchen utensils, which is the first one that you'll have to clean.
The game mechanics are a most welcome and relaxing distraction, since you simply have to press your finger to the screen to clean the objects. The movements that manage to eliminate the highest percentage of rust continuously, without taking your finger off the screen and without going through an already clean area, will be rewarded.