In Buddhism can all we percieve / experience b used as teachers?
The Buddha told us the three marks of existence, all things which exist in the mind have these properties:

Sabbe sankhara anicca
Sabbe sankhara dukkha
Sabbe dhamma anatta
All conditioned things are impermanent, All conditioned things are suffering, All things are without a self.

This means that everything has the potential to teach us. We can learn about impermanence, dukkha, and not-self from anything which arises in the mind.