Perhaps this helicopter is actually a better size for ants rather than people, but it is definitely a fun little LEGO build. GolPlaysWithLego has built this great microscale helicopter out of 30 LEGO parts.  The fuselage is built using some of the newer 1×2 curved slopes with notch and the tail rotor is a boomerang. Clever use of parts for a small build!

GolPlaysWithLego has provided a list of parts including their Design ID and then a breakdown image to show how to assemble your own nano helicopter.