To make the brick you will need yellow clay and black clay.
It is really not that hard to make :p
Step 1: Making the Brick
1. You take the yellow clay and form it into a cube.
Like in the first picture
2.After that take black clay and roll it out so its long and skinny.
Step 2: Detail
1. Take the black clay you rolled out and wrap it around the yellow cube cut the extra black clay off then wrap it around again and repeat till the cube is evenly spaced out.
Step 3: More Detail
1. Roll of more black clay and cut it into little pieces.
2. Take the little black pieces you just cut and stick it between the lines you already put on the cube as shown in the pictures.
Step 4: Completed Brick
Now you have a clay Mario brick.