Star Wars Lego chess set.
Make It: Lego Man Crayons - Tutorial #kids
LEGO lamps (tutorial; haha, like you really need a tutorial for this one!)
This is the most expensive Lego brick in existence
LEGO Key holder. Brilliant! Could do this with bathroom passes in the classroom too.
How to build a working Lego candy dispenser! Step-by-step instructions.