I've finished making all the caveman era units and structures (that includes icons) although I'll probably upgrade the icons before release >.< some aren't my best work.
Anyway, for those who don't know...
Melee Units:
-Caveman
-Basher
Ranged Units:
-Rock Thrower
-Boulder Pusher
Turret Units:
-None

Aerial Units:
-None

x 2
Structures:
-Bashing Facility (Unit training)
-Pile of Food (Storage)
-Rock Temple (Temple)
-Wall of Pictures (Library)
-Nothing (Factory)