No, you have to choose a new plate. You cant keep the blue ones. Well acually you can keep them you cant use them though.
When it'* time to renew
If you have a blue plate, you will have a couple of options when it is time to renew it:
* You may choose the new standard plate as a replacement. There is no fee for the new standard plate, other than your regular registration fee. Personalized or amateur radio blue plates can have their current letter-number configuration transferred to a new standard plate. If you wish to order the new standard plate before your blue plate is up for renewal, you will pay a $5 replacement fee and your new registration and tab will expire on the same date as your current registration and tab.
* You may select another license plate. The department issues a number of attractive license plates, including the new Spectacular Peninsulas plate ($5 fee), the university and special cause fundraising plates ($35 fee) and the Olympic plate ($25 fee). Orders for these plates can only be processed by mail or at a branch office. For more information about all of the department'* plates and renewal options, please refer to The License Plate Renewal Guide.