Quoting MCLegoboy !
Why is it that when we think of an insect, we always choose the wasp or bee color pallette?
Oh, that actually wasn't the reason why I chose those colors. Black as a structural color was a given (that's obviously one of the few colors many of those small Technic pieces come in), and I used yellow just because I had the right pieces I wanted in yellow (the double sockets and the armor piece at the top of the torso). But you're right, it does sort of look wasp-ish...