This 5x5 LEGO cube is a small size cube that you can build out of regular LEGO bricks.

You will need 21 pieces of regular LEGO bricks to build this cube.

This 6x6 LEGO cube is a little larger than 5x5 LEGO cube. In this model, I choose five different color to build this cube but you can certainly use a single color or any other mixed color. You will need 24 pieces of regular LEGO bricks to build this cube.