A good idea for a small bathroom, under hanging shelves for things like cotton balls, cotton swabs, etc. Also great in the kitchen, for a spice rack over the stove. Just hang jars from bottom of the cabinet.
Homemade air fresheners: essential oil scent of choice, gelatin, salt, and water. I don't find these very attractive, but I love the idea. So I think I'll look for non-transparent jars and skip the food coloring.