The boys chose their own Halloween costumes this year. I thought their choices were pretty good illustrations of their differences. Andrew (14) chose to be a Dalton Academy Warbler from the TV show Glee. (This is a singing group from an all-boys' school.) Michael (11) chose to be an elite soldier from some unspecified armed service. Both were very pleased with their costumes.
Incidentally, Michelle made Andrew's jacket (and one for me...). I thought it turned out really well, better than other jackets I've seen on the net. I found the Dalton Academy patch on Etsy (I've also seen people selling them on eBay). The red piping was seam tape ironed on with heat activated tape (I can't remember what you call it, but you can find it in fabric stores.)