For a walkway we typically recommend smaller sizes such as the 6x12s, or 12x12s.
It's best not to go with a pattern since the area is too small.
The 6x12s can be found at the following link: http://www.travertinemart.com/products-page/6x12
And the 12x12s: http://www.travertinemart.com/products-page/12x12
Please let us know if you have any additional questions!