If you want to make use of OCA/OCP/OCM logs on your resumes or business cards or blogs, I would suggest them to download and use the registered logo from Oracle Website.
The people who are looking for logos apart from suggested and registered, searching for images can download from Google Images Oracle OCP Logo.
Download OCA/OCP/OCM Logo from Oracle Website:-
You will receive a Certification Success kit with welcome letter upon completion of your Oracle Certification. In welcome letter you will find Username and Password to download the logo from Oracle Certification member site.
Click here for Oracle Certification member's website
If you lost or forgot your username and password then contact email@example.com with your Prometric ID, they will provide the username and password to download the log.
Click here for OCP logo Guidelines document.
Click here to learn on Oracle Certification Programs.