Color Coded Food Products
Different colors for all important differences in similar products so there is no confusion between them and coded to protect against posssible allergens in foods. One example would be to add food dyes to dairy products like 0% Milk would be blue, 2% would be green, Whole Milk would be orange. This would speed up shopping and for those who see a product on sale but can't see or read the labels would then choose the wrong product. Basically a very obvious way to tell right away that what you put in your cart really is what you wanted in the first place.
Reward: Some Orange colored milk, please...