My plates are worn out and did not pass inspection. Can I just bring them into the registry and get new playes?

You can do it in person, or by mail: Mail the Application for Registration http://www.dmv.ri.gov/documents/forms/registration/TR-1.pdf and the Application for Remake of License Plates form http://www.dmv.ri.gov/documents/forms/registration/RemakeLicensePlate.pdf with the appropriate payment ($32.50 for standard plates) to: Division of Motor Vehicles Attn: Plates 600 New London Avenue Cranston RI 02920.

Negative. they have to be manufatured.