They will 'approve' of structures by placing their hands on their hips and nod, or by clapping their hands next to it.
They will randomly enter/exit the Town Hall. When a Villager exits the Town Hall, they appear to be doing something with their hands. They will then wander off.
They may sometimes walk up to a Hidden Tesla and clap while visiting/observing the base, thus revealing the position of a hidden building to an attacker.
Villagers will not clap in front of other hidden objects such as Traps.
After Villagers have roamed around the village for a while they will go back to the Town Hall. This means that they treat it as an Army Camp, so if it is moved around while the villagers are walking back the villagers will track it like an Army Camp.
On a war village, a villager may clap where an obstacle is on your regular village.
They have green dresses, yellow belts, pouches, red hair, and are barefoot. They also appear to have a blue cape that they drag behind them. In the achievements section they appear to have brown-red hair, however, in your village, they appear to have pink hair. They are also quite skinny in size.