Look for already writen theses in Orbit - The DTU Research Database:
Limit your search to "Academic Dissertations". Notice it's necessary to mark "Department records" for just submitted theses.
Thesis before 2008 you'll find in Pubdb.
Historic archives:
Read guidelines to standard typesettings ph.d.-theses at DTU Informatics, how to get started, and how to hand in to the institute printing office.