One of my favorite things about MAC, is that you can actually select your favorite eye shadows and group them into one of this "quads" (They also have the Pro-Palette that holds up to 15 eye shadow pans).
This quads are really confortable, you can carry them around and you can even re-use it! Once you hit the pan you can just buy the individual eye shadow and replace it! So you are not limited to use the same colors! xo
MAC Custom Palette - Quad
I tried to select a variety of colors, but I always end up selecting lots of brown/earthy tones <3