First we start with our 7 chips laid out.
We then place the next layer slightly to the left or right (your preference) to the previous layer of chip. Use the label or inlay of the chip to use as a reference guide. Keep doing this And eventually you will get your completed stack.
That is the basic design, but you can be more creative. You can use use your chips with edge marks and align them in a specific way to line them up as well for more of a unique design that will catch the eye. Many people start a spiral of 4 chips on top of the stack of 7, etc. There is no set way to stack, just use the basic principal and your imagination and you will surely create something amazing and unique.