Great post.
Our team decided to "grow up" last season. I charged students to come up with a more refined logo.
Our original logo was a modified school logo, with a viking helmet and gears:
But it was very cartoony. So we moved to this logo:
Teams that knew us complemented the change. I think the students did a good job of reflecting where we are from (Marina logo) and what FRC is all about (gears, circuit, code)... and still managed to keep it fun.