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Eldarerathis summarized it very well. To add some things: The 1.1 version was internally called Petit Four by Google, and that's how it all began. Google is installing a giant pastry on their lawn at Mountain View each time a new version is about to be launched.

You can see pictures of that display at different stages here:

Overall display (Cupcake to Eclair, with Nexus One) Donut, Android logo, Nexus one, Cupcake, Eclair

Honeycomb http://eurodroid.com/pics/honeycomb_statue-1.jpgHoneycomb

Eclair, Froyo, Gingerbread, Honeycomb and Ice Cream Sandwich Froyo, Gingerbread, Icecream Sandwich

Gingerbread, Honeycomb, Ice Cream Sandwich and Jelly Bean

Gingerbread, Icecream Sandwich, Jelly Bean

Kit-Kat http://www.droid-life.com/wp-content/uploads/2013/09/kitkat-android-650x433.jpg KitKat

Lollipop Lollipop

Marshmallow Marshmallow

Nougat Nougat