According to domain blog it may be possible to register domain names that the Commission has blocked:
With a good reason it is possible to ask for reserved names
The European Commission has reserved a number of .eu domain names that are consequently not available for registration. However, should there be organisations or private persons wishing to register some of these reserved names, the Commission is willing to consider releasing said names provided they no longer have any use for them and are provided with a good motivated argument as to why the names should be released. Requests to release reserved names should be addressed to EURid who will then forward the request to the Commission.
A full list of the names that have been reserved is available here
A cursory glance at the list does not show that many overly attractive domains, though there are some which could be of interest.