OK, for everybody out there with the 5-cube, this is the most difficult
pattern I have come up with to implement (which is still highly ordered).
Top: |A|A|A|A|A| |A|B|B|B|B| |A|B|A|A|A| |A|B|A|B|B| |A|B|A|B|A| Front: |B|C|B|C|B| |C|A|C|A|C| :thgiR |B|C|B|C|C| |A|A|C|A|C| |B|C|B|B|B| |C|C|C|A|C| |B|C|C|C|C| |A|A|A|A|C| |B|B|B|B|B| |C|C|C|C|C|
Where this pattern is also present on the remaining 3 sides. (This amounts
to twirling a 4-cube, a 3-cube, a 2-cube and a 1-cube around a pair of
diagonally opposite corners in alternating directions. It's not difficult
to do after you've done it a couple of times, but the potential for getting
confused is surprising.