You have 8 cubes of 4 different colors, 2 cubes of each color. Can you think of a way of combining the 8 cubes to make a single cube such that each face of the larger cube has all 4 colors?

After I thought of this problem, I was on the verge of making a model to solve it, but then realized that if you think about it the right way, you can solve it in your head.

Here is a hint. Instead of working on the colors for a given face, think of how a given color can be distributed to all 6 faces.