I like these mostly because they're pretty, but can you imagine trying to keep kids from playing with them? They'd be irresistible!
SFHandyman has posted the directions on the instructables website.
Implications - What crazy Jell-o LEGO creations would you create? Personally, I would just be so overjoyed to have edible LEGO that I'd probably just build a brick and scarf down the whole thing. Who needs to be creative when there's Jell-o involved?