There was some discussion about the Finder icon in a previous thread a while back. It's a riff on the original 'Happy Mac' power-on-self-test icon. My take is it's based on the reflection of the user's face against the monitor, reflecting enjoyable human-computer interactions. Also you get a smilely face on your screen.

This icon goes back to the Mac Clone era when they wanted separate branding for System 7.5 etc. Kinda funny it survived Jobs and is still around.

Also, IMO there's a lot of undue nostalgia for Snow Leopard. But that 3D Dock was cool. (It didn't do that when you put your dock where it belongs, on the right side.)