Sure, you could decorate the exterior of a cubical cake so that it looks like a Rubik's Cube from the outside, but Vicky McDonald went beyond that goal for her cake in honor of Erno Rubik's birthday. As you slice her cake, it continues to look like a Rubik's Cube, with varying interior colors. She provides instructions on how to make one at the link.
After posting this marvelous creation, she received an email from Rubik himself:
Thanks for the nice birthday surprise which sweetens the bitterness of passing time.
Link -via The Mary Sue
Previously: Rubik's Cube Cake