This 1 gram missile can be placed on the end of a drinking straw and launched, by blowing through the straw, across the room.

Inspired by http://www.thingiverse.com/thing:26571 and paper-wrapped straws everywhere.

Warning: Not Intended for young children! Adult supervision suggested. Never point a sharp object at anyone's or anything's face.
Ralphie, you'll shoot your eye out!!

Printed on Replicator 2 using MakerWare default "High" resolution settings (i.e., 15% infill, 2 shells, 80mm/s),
except with Layer Height of 0.3mm

For everything except the nose cone, the number of shells is irrelevant (at least on my software&printer) as it was a single shell for the fins and body.

With these settings, the 60mm tall rocket prints in 17 min and weighs 1g.