It would seem that replicating a Rubik's Cube in food is quite a popular feat.
There's the Cubewich:
Many cakes including some efforts which are better than others. This one is amazing, the full story is on the Dream County blog.
This one from My Life as a Reluctant Housewife deserves an honourable mention. If only it hadn't got damaged in transit:
Then the National Watermelon Promotion Board got in on the act with their (surprise, surprise) watermelon version:
Then there are salt and pepper mills for your table:
I wonder what everyday objects or toys I can reproduce in food...