First off, congratulations and thanks for sharing! You have a sequence working and actually have the video to prove it; which is farther than some of us have gotten this year.
You nailed the ending, and thats what folks remember.
As for enhancements; you didn't mention what you are using for sequencing, but have the on/off mastered. Now go back and add fades or ramps as they call it in Vixen. This smooths the transition between on/off of different colors and gives more "feel" to certain sections of the song...a hard on/off is still most appropriate for staccato changes though.
Extra channels are a blessing and will CYA if you lose a channel during the season because you can simply reassign your sequence from a bad output to a working one and be back in business. 16 extra might be a bit much though, so add some more elements, or break up what you have. Don't now how your pocket book is, but put a few more of those window snowflakes on the roof and make them dance. I can't see the roof, but if you can attach the strings with shingle clips and space each string about 4 in apart, that will allow some nice effects...a lot of work though.
Have fun with it and thanks again for sharing,
Mike E.