An example of generating RDF Schema from Freebase data:

The Google Data-Vocabulary Ontology
A piece of the FOAF Ontology

You can view Freebase Types/Properties as RDF Schema as well:

Types & Properties in the /people domain
Types & Properties in the /location domain

For added fun, point Protege at these URIs!

http://rdfvocab.freebaseapps.com/rdfsvocab?namespace=http://rdf.data-vocabulary.org/%23
http://rdfvocab.freebaseapps.com/fb2rdfs?domain=/people

Freebase CC-BY
Source: Freebase, licensed under CC-BY
View the source of this app