I made a rocket for my nephew for christmas, a colour star provides the engines and a codebug does the countdown sequence.
A 2L drinks bottle provided the fusilage and a cardboard box supplied the fins.
I had to sacrifice a better battery than intended as the cheap one kept turning itself off during the countdown (power save feature).
My brother-in-law was slightly disappointed witn the feedback, apparently the lego millennium falcon was quite expensive so becoming second best present was a little blow.
Here's the code.
Pictures to follow.