Of course, if you're using measuring cups to add a variety of ingredients together into one big group, it helps to have something in which to place them before you start cooking or baking. A good set of mixing bowls, possibly in a few different sizes, allows you to prepare any number of meals easily without making too much of a mess. If you have lots of leftovers, they're also a good tool for storing food.
Depending on your preference, you can choose between stainless steel, plastic, silicone, wood, ceramic or glass bowls. Some come in bright colors and some, like those made of silicone, are flexible enough to make pouring from the bowl a less-messy process. When mixing ingredients in these types of bowls, especially stainless steel, it's a good idea to use plastic mixing spoons or spatulas instead of metal ones, since plastic won't leave unsightly marks and scratches.