Little Pistons Logo Concepts

So my wife and I are working on a line of shirts for kids, and we're naming it “Little Pistons”. The loose concept behind the brand embraces the constant, yet often manic energy possessed by the little ones in our lives. We feel that's something most grownups can relate to because let's be honest, they're the ones buying the shirts.

We're feeling pretty good about the primary logo but are still fine tuning the secondary logo(s). I'm looking forward to expanding on this project as I will handle all creative duties. This includes the online presence as well as shirt graphics.