I have since completed my challenge but I encourage you to visit the challenge blog and see the work of others tatters who are still participating in the challenge. And if you have not done so, you may be tempted to join up.
The picture above is showing four of the square blocks joined together to make a bigger square.
Pattern uses two shuttles
The written instructions
R(3-3-3-3) , reverse work (rw).
C(4-6), do not reverse (dnr).
(*)Switch Shuttle (SS), R(4-4-4), rw. C(6), dnr.
SS, R(3-3+3-30, join to the middle picot of first ring, dnr
SS, C(6), rw. R(4+4-4), join to the adjacent ring at the second picot, dnr.
SS, C(6-4), rw. R(3-3+3-3), join to the middle picot of the opposite ring, dnr.
SS, C(4-2), dnr.
SS, R(2+4-3-3), join to the picot of previous chain, dnr.
R(3+4-4-3), join to last picot of previous ring, dnr.
R(3+3-4-2), join to last picot of previous ring., dnr.
SS, C(2+4), join to last picot of previous ring, dnr.
SS, R(3-3-3-3), rw. C(4+6) join to picot of opposite chain, dnr.
Repeat from (*) to complete the motif, replacing the first picot with a join to picot of the adjacent ring.