order 4

order 4, rotational symmetry designs (11 by 11 grid):  

or more intricate ones like Jamal Muhsin's:
(mostly 25 by 25 grid)

(a copy, based on the one below)

or, for the even more adventurous, try some labyrinth tessellations

for order 4 patterns see Brian Eno's 77 million paintings (various locations)