I used to mash the sugar and food coloring with a fork, too, but when my daughter started selling Tupperware, I was constantly trying to come up with uses for some of her Tupperware products. Shaking the colored sugar was inspired by the snack cup and seal; one, because it is easier, and two, the colored sugar can be stored in that container, meaning less dishes to wash.
To Pat,
I did not claim that the idea was mine, nor were my intentions to step on anyone's "toes". I'm sure most of the information offered on this site could be "claimed" by more than one person. I thought the purpose of this site was to share information that could be helpful. Sorry if I misunderstood.
Southern Saver